Replaced the ignition switch and key on my streetbike based track-only race bike. Chrome toggle switch on a hand-formed aluminum mini panel. Two options: On and Not On. Inspired by, and in tribute to Uncle Doug!
My god this is good. Off is trite, so are fender champ chasis...you are a master smart aleck and I know a former Hellraiser when I hear him...I've already had a good laugh today! Good to know you are there guys! Have a great day everyone!
Thanks, WTD. Rusty and I have calmed down considerably from our early days of biting ankles and chasing UPS trucks. That early foolishness no longer seems appropriate at our advanced ages :)
I am an electrical engineer become chiropractor, and amateur musician all along. You have inspired me to get back to my roots; I'm going to attempt an amplifier design after watching many of these videos. Looks like a lot of fun!
Reply to Not Me: Part of learning any new skill, NM, is the ability to think and work with increasing independence....taking responsibility for your own learning. If you wanted to learn how to play golf, would you be better off having someone play 300 holes of golf while you watched.....or having someone explain the basics of golf and then allowing you to practice, learn, and develop your own skills over time. The first method is utterly passive and appealing because it requires no effort. The second method requires participation, focus, personal responsibility, and hard work. As a long-time teacher, I can tell you that only one method works.....and it's not the first one. P.S. Your reply would work if you simply altered your privacy settings to allow people to respond to your comments.
I am very sorry to hear of your failing health, NM. Have you considered buying an amp kit to build? You will receive all the necessary parts, excellent instructions, and tech support if you need it. The Weber kits are particularly good. Best of luck to you.
Uncle Doug, love your videos!! When you showed the remnants of that Precision signal generator you brought me all the way back to 1968-1972. We used that exact signal generator in my Radio-TV shop classes at Wm. E. Grady Voc-Tech HS. You’d think by now Rusty would have gotten used to GLORIA by now!! Lol Thanks for such excellent info...👍
Dr Doug .. I am glad to find this learning Exp in watching you Build this piece fender champ aint got anything on you .. I have found the Piece I am interested in .How do I contact you about recreating this piece for Purchase ? With a 10 " Jensen . I know nothing of electronics . please let me know thankYou .
Awwww, Rusty♥️ he just added that little comedic touch! Good thing the kitty squad was able to step in and take up the slack. Still, in all, these videos are a treasure of knowledge! Thank you for these, Uncle Doug!
Excellent video. There's a company selling a kit to make this amp (I'm sure you know of it), but your video will show me how to make a much improved version for less money. Thanks for sharing your knowledge.
+AgentJayZ You're welcome, JZ. I believe there are several kits available, which are great for first-time builders, but building from scratch is less expensive and an interesting challenge for those with more experience. Good luck with your project.
Thanks for this video , even though I wasn't building an amp I watched , just to learn a little more and it gave me an ideas. My amp , a 15w solid state , was making all kinds of hum and horrible high pitched noise. I noticed you twisted some wires , all the alternate current leads I believe , together and ran them high instead of a long the bottom of the chassis. That gave me an idea and I tried the twisting on a few wires. Presto , it sounds %100 better. Not sure why but it also works on input and speaker wires. Anyway , thanks Uncle Doug !
Congratulations to you Uncle Doug.You may be happy to know that I built a 5f1 amp out of a Hammond ao39 chassis,power transformer and tubes.I drilled a hole for a 6v6gt and followed your videos and a 5f1 schematic and I am happy to say "IT PLAYS" and you are awesome...DUDE! Thank you for teaching us.
Hi Uncle Doug!! I´m looking forward to learn about electronic just to understand and be able to build up my own amps and stuff.....Your videos are so helpful and clear. Thanks for dedicate the time to register this material. Greetings from Argentina
This is a perfect example of where modern electronics fail, With a little imagination and lots of know-how, you went from a pile of bits to a very nice sound amp! I know nothing of vintage tube point to point electronics, however, your wiring job is so clean and well-executed It makes me almost think, even I could stand a chance of making one.
Thank you, thank you, thank you! I built one of these about 2yrs ago. Put it away and forgot about it. Got tired of playing violin and decided to dust off my guitar equipment. An idea popped in my head to swap out the RCA output plug for a 1/4" jack setup. For some reason my brain took a vacation and I couldn't figure out wiring. Watching you talk about your impedance switching mod and showing the schematic....DING!!!...The light came back on! Excellent job on the amp!!!...After looking at yours I might go back and do some housekeeping...I feel guilty after seeing your tidy work...
Hi Doug , I had a bit of back and fourth with you some time ago , your videos have inspired me, I did the Vox v15 and then I wanted to make one from scratch . I made the chassis soldering the galvanized sheet after bending and the cab is a wine box and some old wood i had lying about . Long story short without you and your kind and patient explanation I would have just never done this . I have a bit of mains hum but I know why this is and I can live with it . Again you are the man and you have a special gift when it comes to teaching you just seem to know what the questions will be and how good it feels to know very little and have things explained in a simple yet detailed way and the light turns on . Respect . Nikk
Thanks so much for your very nice comments, Nik. I'm really glad that the videos were helpful and your project turned out so well. Please keep up the good work :)
I'll be damned...I built one of these from scratch about a year ago, my first tube amp build (I don't play guitar, but my brother was going to take lessons and wanted a small amp) but the thing was plagued with an annoying 60hz hum I couldn't track down. I was routing and re-routing filament wires, even tried shielding them. The fix was your two resistors to ground trick. Thanks!
Thanks for the videos and great commentary. Normally I'm not of fan of commentary but yours is informative and clear. I look forward to checking out some of your other vids.. Thanks Uncle Doug.. subbed!
You do great work and explain things very well. I've been building guitars, amplifiers, and recording stuff for almost 60 years and yet I learn things from each one of your projects and presentations. I'm envious of your great work habits. Best wishes.
TheTrackingstation Thanks so much for your very kind words, TT. Coming from someone with your extensive experience, this is very high praise and I sincerely appreciate it. I'm glad the videos are helpful. Thanks for watching :)
I've been wanting to build a tube amp for years but never have any money to do so I feel like I can salvage my parts now (your video on power transformers was the greatest thing since sliced bread) THANK YOU ROCK ON DOUG YOUR THE MAN!!
Sandy Shuman, your comment came without a "Reply" capability, so I'll answer it up here and hope you see it. This issue was brought up by a viewer, who recommended that the NFB loop need not be switchable, but simply connected to the 8 ohm output tap of the OPT. The problem with "switchability" is that it alters the amount of NFB, rather than simply applying it equally to either output.
Uncle Doug hey uncle Doug I'm 48 got int the trades as a broom pusher for an Electrical shop in Downey Ca. At the age of moms saying get a job or stay in school at the age of 15 Long story short quit school there was sum ditching involved too this career that was chosen for me was a blessing . Sooo it wasent till the latter part of my career that politics split our electrical shop in halph so always yearning for electronics I went that way. Is there a way I can get ahold a yah. I purchased a whole lot of tubes Heathkit CB units marine also and tons of personal board designs from a Japanese man that retired from skunkworks in 69 so I realized not the value but the history with tons a top grade military and top a the line consumer manufacturers tubes resistors wax caps and on and on Looked on ur UA-cam videos n really can't find a way to contact u.can you please if u look at ur comments reach out for a father son conversation. To help me more of sum of the things I aquired for givin up 6 of my 1887 uncirculated silver dollar coins Take in mind this guy had a big lunch box and had aquired his two garages full of military grade electronics stuff thru his career so My first ever shakin at the teeth saying Wat would it cost for everything Paintings n cool American Japanese historical things U can reach me at rlrojo @mail.com B was Ruth ur while or I'll pay for ur knowledge try ray
You should start your own merch line with t-shirts that say "I learned everything I know about tube amps from Uncle Doug." But seriously, you've been a big help as I've knocked together amps from old parts over the last couple of years, so thank you and keep up the great and informative work!
You're welcome, Mutt. If my partner had his way, the shirts would read "I learned everything I know about tube amps from Rusty the Wonder Dog" :) Thanks for watching.....and for your kind words. ^. .^
I found the Scratch Built Fender Amp very entertaining and educational. I'm not in the least bid electronic, but found myself biting at the bit to try! Great job and very nice sounding.
Thanks for your vids. I added the two 100 ohm resistors to ground from the filament leads on my 1956 Ampeg Guitaramp. HUGE difference in background noise. I also found a single green and white wire coiled under the power transformer that appears to have never been connected to anything. I ran that to ground and the noise dropped FARTHER. Nice and quiet amp now.
Thanks for the clear and concise description of this build, it gives me a bit more confidence knowing what to expect when I build my very own amp.Great stuff!
@@UncleDougJust a few more visits to the re-cycling yard and my 1st amp will be ready. I actually found a rusted chassis from a very old Deluxe amp , had to replace most of the parts and learned via Trial and error and sweat how to get a noise out of it. It's basically a Radio without the reciever and I wired the cable straight to the CTS volume pot (no tone yet). Have to thank you cos a year ago I knew how to put circuits together but never really knew Why they worked, thanks again.
I knew a tech who told me this. He charged $100ea to do this...He said that transformers are not perfect. That you should measure the outputs on the transformers, For example. If you have an output of 5 volts on one and 6 volts on the other you should attach a pot to the 6 vol and decrease it to 5,. he call it phasing the tubes. I heard the difference. It was amazing. You are truly a Genius. I envy you so much. Thanks for the fun : )
Hey Uncle Doug & Family, I hope you are all doing good. Always the best in tube amp videos, thankyou for your time, effort & years of experience which you so kindly share. Don't really do holidays any more, but, would like to wish you and yours all the best, every happiness, and, a Happy Year End!. Take care, be good, Cass.
+Cass Virgillo Greetings, Cass. The whole gang here at Uncle Doug's madhouse and menagerie sincerely appreciate your kind comments and holiday good wishes. We all hope you have a great holiday season and a happy, tube-ampalicious new year :)
Hi Uncle Doug & Rusty, He sure seems like a good 'ol boy, I mean the dog, and, you to Uncle. I am so glad I found your channel, a wealth of information. It's on my list to scratch build a tube amp that rocks. I built a current limiter as per your video and it worked perfect. All I could get for now was a 250W heat lamp with a resistance of 5.0 ohms. I shorted through a $20.00 DVM and it still works perfect, thankyou. I am subscribed and check all the tutorials I can. Take care, be good, C.
Cass Virgillo Greetings, Cass. It sounds like you are making good progress on your way to building your own amp. Thanks for watching and subscribing, and best of luck with your projects.
Very enjoyable. No wonder we now have a flood of small amps that are cheaper than the equivalent kits now we can see just how simple a tube amp can be.
Great series on what to do with the bits and pieces that are laying around. You really did great job on this project! I left off last night with the completion of the cabinet. I watched the cabinet build and I thought about how cool it would have been to build a cabinet along the lines of an Ampeg B-15 Flip-Top for this project. This amplifier would be perfect to emulate that style. I was watching this when you replied to me last night about my Hiwatt. I'll be opening it up in a few hours and thanks to you I have a good understanding of both the technology of the amplifier and a good plan laid out. Thanks and all the best!
jcmcclain57 You're welcome, JC. It's great to hear that the videos are helpful. Best of luck with your Ampeg B-15 project.....let us know how it turns out :)
Nice tip. Making the virtual center tap I would have never thought of. Nrgstive feedback is common on amps. It puts a negative or opposite of the sound wave distortion. Thus it cuts the the distorted part of the wave more because it is at the top of the signal. Adding tone controls is a no brainer. I would sdd those. All in all, good job!
many thanks Uncle Doug for this video, wich was very informative, again ;-) I'm restauring a stereo amplifier from the 1960's, and was wondering why the input transformer has 2 resistors wired on the 6.3V plots...thanks very much for revealing this "virtual center-tap" trick ! thanks to your videos, I'm knowing what I'm doing, instead of simply changing parts, and making an old electronic running. best regards to you, and a hug to Rusty
Thanks Uncle Doug for all the great tutorials, they're really helpful. And love your dog Rusty, funny how he always slips away when there's works to be done LOL
You're welcome, TT.....glad to hear that the videos are helpful. Yes, Rusty is much like having a teenager around the house.....disappearing whenever there's work to be done (as you said) :)
Well, Jack can probably relax now. I have made it to the video you referred me to. And, it dawned on me that a few years ago I restocked my 1/2 watt resistors, and do have some other new parts in my parts boxes. So, took the plunge and ordered up some transformers and a few other bits. I had some cabinets built and stored too, but I am going to go in a different direction now after watching many of your scratch builds and vintage amp repairs. Maybe a SILVERTONE MODEL 1391 style, with a bit of my own flavor. You are an inspiration. Look out for my upcoming house fire video.
Hi Uncle Doug, good stuff, home grown. It could be a Proto type or even a Master Seargent himself that had fun all day long at work. and saved the day for good friends and buddies who did the same in return. Love the stuff... The Old timer himself Eddie.
I just watched this Video again can't Get tired of it Again nicely done You are a very fine teacher. You are Probably becoming None around the world Of those who like Electronics projects I still like your funny Sarcasm. Dwight.
@@UncleDoug Your Welcome Uncle Doug. Dani Sonic. If you put out anymore vids I'll Be watching. I can not afford any financial support but I can promote and share. I have allot of bills to Pay. Thank you for who You are. You make the world a little easier. We need more like you Keep sharing we will Thank you for it in one way or another Your friend. Dwight Allenpark,mi.
Hey Uncle Doug, that's what my dinner table looks like after, during, and (EMBARRASSED) yes before I replaced a simple piece of any works, I believe it's a sign of locating what you need, when you need it,or so I tell em!! LOL
Greetings, Nelson. If your dinner table is anything like my workshop (in the video) then you must be losing weight......because you can't find your dinner :))
Very inspiring. I'm preparing a similar project. Using 5F1 schematic but adding some extra features like bass, mid, treble control, line-out, master volume control and etc..
I made the same! thanks, I took lots of references from your videos! I made it under 30 dollars, I found the power transformer in a Junk Yard in perfect conditions and some components from a vintage stereo console! greetings from Chihuahua, Mexico!
I can tell that you are excited about this successful project, Heriberto, and you should be. When completed, please post photos of it on my Facebook page: Uncle Doug's Vintage Amps. We would love to see it.
After my Tweed Deluxe from a Thomas organ chassis project, this shall be #2. I have a cute little Yamaha "Budokan" combo cab with speaker that I ripped the el-crap-o amp circuit out of. I see a "Budokan No Chanpu" amp in my future. Thanks for the tutorial; your stuff is slowly percolating into my somewhat challenged brain.
Just saw the "On" & "Not On" . Woke my wife up as I was laughing. She looked at my PC & said "that guy is probably just as weird as you are". I thought, "Yeah, probably" :)
You're welcome, Rik. We try to be practical rather than purely theoretical. If you haven't already subscribed, please do so. We've posted almost 150 videos similar in style to this one.
I have returned after 2 years of rukus to find this video. The NFB is a delight. I have a Kustom Defender 5H with a EL84 instead of my fave 6V6 any way I had to find a Russian site and translate it to get all the mods Tone stack and Master vol) . The one thing missing was the NFB. Turns out the Defender 22K to the second section 12AX7 Cathode made it silent there is no joy in Mudville. So, I put a 500K in series with the 22K and the vol was still low so I think a 1 Meg pot + a 100K might do it. . I enjoy your videos and have learned so much. Thank you for all you do. Hope you are well.
@@UncleDoug LOL if you want to have a chuckle, here is the Russian site for the Kustom Defender 5H. The translation is not so good. :) forum.guitarplayer.ru/index.php?topic=158288.30
Effectively they are saying for the Kustom Defender 5H, is; remove R3 the 0 zero ohm resistor and insert the Fender tone stack into the two empty holes. . Treb lead to the top hole, Mid lead out to the bottom hole and ground to ground. This bypasses the stock PCB tone circuit. Fender tone stack (Bass 250K pot treb 1Meg pot mid pot 200k, Bass cap .047Uf, Mid .022uf, Treb .220nf + 68k joined lead out to solder point connection. (treb cap-resistor in parallel. ). Also remove R15, R16, C15 (above the stock vol pot) .............(it's the stock tone circuit) ................................................................ Then for the Master Volume to the EL84 power tube, remove R4, R16 and R17 (voltage divider) and replace with a 1 meg pot (voltage divider) Wiper wired to top of R4, lug 1 to top of R17 hole, and lug 3 to top of R16 hole ( ground)... The amp is a boutique niche that only 1% of guitar players will appreciate , especially 1920-1950s blues fans. Its a screaming Bearcat when pushed, Its a nice tinder box at low vols. This Amp can be had for $89 on eBay. It's a great learning platform. I would like to calc the math on all the circuits. Thanks uncle Doug, I think you have all the videos for me to calculate the math.
Hi Doug! Interesting little modifications! The variable negative feedback is an excellent idea...I've never seen this commonly on commercially made amps, but it's valuable for many reasons! Creating the virtual center tap is a very wise choice here...I've done this to many amps over the years...many of the amps that I've worked on which had no CT on the PT greatly benefited the addition of the resistors! I had one issue where no matter what I did, I couldn't get rid of the AC heater hum. Well, after running it by a few seasoned senior techs, I was given a hand-drawn schematic for the modification...Been using it ever since! Keep the good videos coming! PS: I see Rusty tends to run for the hills when it's shop-cleanup time :)
It's great to hear from you, Frank. I'm glad you liked the video and the modifications. Rusty and I send you our best wishes for a great Christmas season !!!
This was a fascinating watch. In order to accomplish this task one must have an extensive background in electronics. This was a very well made little amp.
Thanks, TF. With some study and practice, I'll bet you could make one too. Perhaps you could start off with an amp kit and learn the basics. It's a very interesting and rewarding hobby.
Uncle Doug That sounds like a great idea. I recall a company called Heathkit years ago. They sold many kits of various appliances, and some were rather good. I think I'll take your advice. You sure seem to make it look easy, though.
Take a look at the kits offered by Weber: taweber.powweb.com/store/kits.htm They are of good quality and would be an excellent learning experience. Good luck.
Uncle Doug Thanks for sending the link, Doug. I'll get on this for sure. At my current age a new learning experience would definitely be an "experience". But it would be well worth it.
Thanks so much for this series uncle doug!!! I have gone from knowing not a thing about how these amps work to almost knowing how to build one, the electronics still confuse me a bit because I know nothing about them, especially the schematics that's where it loses me the most but the cabinet building I can do as I am a joiner/cabinet maker myself and will be constructing my first guitar speaker cabinet tomorrow. I will be looking more into the amp building side of things and reading a few books and I might just give It a go to see what I can come up with! Thanks again these videos are incredibly informative!!
It sounds like you have quite a nice collection of vintage amps, Thomas, and I am pleased that you like the scratch-built Champ. If you'd like to discuss a purchase, please contact me by Private Message. Thanks again for your interest and input :)
A work of art. Shame to hide it in a box. I liked the lower value nf. Even though I'm a Fender player, (and hate humbuckers), I like clean, mid-rangy amps. An inexpensive, worthwhile addition. And a remarkably simple circuit. Most edifying, sir.
Great as always! In the last couple days I made kind of a champ, but mostly based in the 5c1 schematic, with penthode preamp and no feedback resistor. The penthode in the case is an ef184. Also made a tone control. The output transformer was a 7,5 volt line transformer that I reconfigured for single ended use. Overall, it costed me about nothing, and sounds great
P.S. been meaning to tell you that your handmade pieces are beautifully artistic. Outstanding work even as non-functioning installations...but function they do. I don't know for sure, but I suspect this is what shinola looks like...can never get a clear answer from anybody on that one so I am forced to make a call... shinola. Later on Uncle Doug...
A bit of a related question: On both the Leslie 122 and 147 amplifiers, the plates of the 6550s are linked back to the grid with 56k resistors and coupled with 100pf/1000v capacitors. Do you think these may be negative feedback loops?
I looked at a schematic and must agree that it does appear to function as a NFB loop. This circuit would inject a fairly high frequency (the portion of the signal that can pass through the 100pf) out-of-phase signal back to the grid, which would neutralize some of the high frequency portion of the incoming signal. The overall effect would be to reduce shrillness perhaps (?).
Thanks :) High praise indeed, AO. For those unfamiliar with the term, NEETS stands for Navy Electricity and Electronics Training Series which is an exhaustive manual on all aspects of electronics theory and practice.
I really enjoy your videos. The 5f1 is my favorite amp. Such a simple circuit and I love the tone. I built the 5f1 (with ClassicTone, my go to transformers) as my very first amp and still that has got to be my go to amp. Really good video.
@@UncleDoug i was wondering if you could make a video on grounding. I have heard of what Kevin O'conner, writer of TUT, calls galactic grounding. Essentially (from my understanding) where a buss runs along and connects at one point on the chassis. All the grounds are connected to their respective filter caps in their circuit blocks and runs along like a river then tributary analogy so that it "flows" along a chain and minimizes ground loops. Basically the whole "circuit" minus the mains is connected to one point on the chassis. Power mains connected to the chassis near the outlet for safety. I think I understand it to some degree (as in knowing what to "do" to build a relatively "quiet" higher gain amp, but at the same time not really understanding it). Currently reading Merlin Blencowe's book which explains his method of grounding. I think alot of amp diyer's can benefit from a video like that especially with the simplicity that you explain things. I have seen alot of people ask and talk about this topic considering grounding IS a part of the circuit.
Hi Uncle Doug! Inspired by your Champ videos I decided to build a 5e1 clone myself. As it was my first full tube project I wanted to built it into a bigger chassis than the original. That made also possible to use bigger transformers so I used KT66 tube. I added also a bias potentiometer so I could use 6V6 with it too. It sounds amazing. Best clean tone I've had.
Olli Kivelä Wow, Olli....Congratulations on a great first-time amp-building project :) Your modifications make good sense and the fact it works so well is evidence of your skill. Keep us posted on your next project(s).
Having a switchable off NFB option works fine, just gives you extra gain and drive. My last build I made the V1 cathode bypass cap switchable, which makes for usable clean tone with the little bugger flat out.
Greetings, Squizzy, and thanks for the good suggestion. I may try that in a future chassis-construction project. I really appreciate your interest and input.
I have never built an amp before, and I am going to start with this exact design! I've had lots of people tell me that it is a great idea to start with a Fender 5F1 Champ for a first amp, because it has so few variables. One thing that I see being a problem is that you used parts that you found, and I will need to order new parts. I don't have the experience yet to sort out which power transformer, output transformer, etc... but I hope the ol' internet can help me with that. I love the NFB loop dial. That is so clever. Also, the variable bias resistor that you can dial in with a screw. I don't know if those things are easily available, but I'm gonna try. Being so new, it is also hard to find a reliable schematic to go off of. There are literally dozens and dozens of Champ schematics out there, but I can't tell just by looking at them if they are accurate or off, and if they are off... off in what way, and by how much. Ha ha ha. Oh well... gotta start somewhere. Thanks for the videos! You should DEF. have a patreon page or sell your amps or something. I'd def. contribute or buy one of your refurbs, if for nothing else, just to say thanks!
Greetings, Michael, and thanks for all the nice comments. I do have a Patreon page and accept PayPal donations to account dldcam@aol.com. The schematic you are looking for is here: i0.wp.com/myfenderchamp.com/wp-content/uploads/2010/03/champ_5f1-schematic.png You can order your parts from Antique Electronic Supply and your transformers from Amp Parts Direct: shop.amppartsdirect.com/main.sc They offer transformer sets for the 5F1 Champ. Good luck.
I just built a 5F1 with a StewMac kit. It’s bog standard, and much less cool looking than this one. But it has every piece you need, and amazing instructions. If you want to go that route, I’d recommend the StewMac kit.
Thanks for the video. I have a pkexi style preamp with ac15 power amp and no negative feedback.. I will try to implement it, if i find i nice setting i can make it permanent. But i guess for cleans its good to have no nf, more bass more highs.. And for overdrive more nf, to tighten the sound. I will try.. My amp sounds a bit muddy, this will help i guess. Contrary to what people say nf enhances touch response snd dynamics. I tried it in my 5e3.. Much better with NF... Can go from clean to dirt just by pick attack.. Your way is perfect for tuning an amp. Thanks alot. Ine needs to listen in real time. If you solder and start amp again you forgot what it sounded before. Direct comparision is so valuable!! Nfb pot, presence and resonance control would be max fine tuning.. Do many ideas thanks
Great build! I'll have to try the virtual center tap on a Kalamazoo Model 1 I have that has some real annoying hum that I haven't been able to sort out as of yet. Thanks for the clear explanation.
Thanks for the videos and sharing your knowledge. It seems that the tubes used in this amp were really popular...the 5Y3, 6V6, and 12AX7's seem like the standard for a lot of small amps. I think I'll use this circuit to make a small amp. I have an old wooden Philco radio cabinet that this would be perfect for!
Uncle Doug did you realize that you had more high at 10K…I wish you did put it full volume at 10K to hear the high notes how they sound ! :) Again thank you and Rusty for the beautiful and educational video ! Keep on the good work ! :)
Thanks so much, Rene. Please also watch the videos in which I build a cabinet for the little jewel. In addition, I am now working on a video showing how to cover the cabinet with material (like Tolex). It should be posted soon. Stay tuned :)))
Love to see your projects, I have just started building my own effect pedals, so this is very interesting to me. I think it's going to be a while before I'm up to building anything like this tube amp, but I have learned a lot from your vids, thanks for making them!
Thanks so much. I really appreciate your kind assessment. I have posted 80 other videos and would like to invite you to check them out. Happy New Year !!!
Hi uncle Doug, I finally made the move and ordered all of the parts for A scratch build. I'm planning of building a 5C1 amp as suppose to the more popular 5F1 . I have a few questions I needed to ask you. Is there anyway I can send you a PM. I already ordered the parts and had bought the pine boards at hOme depot earlier. How is the 5c1 differ from the 5f1 . I watched all of your videos regarding biasing a single ended output amp like the champ. I am looking for a really fuzzy little amp ( early breakout) on lower volumes. Thanks John
Congratulations, John, and best of luck with your project. I can tell you the difference between the two circuits, but it would improve your understanding if you downloaded the schematics for each and made the comparison yourself. The 5C1 is a great choice, in my opinion, because it has a 6SJ7 pentode pre-amp tube (instead of the more common 12AX7). Pentodes generally have a warm tone and should give you the breakup you seek. You should also watch my video on the Tonemaster amp.....it has a virtually identical circuit. I'm not sure how PM's are sent on YT any more. Every time I figure things out, they change everything....:))
Thanks Doug for great little vid, I was just GIVEN a 78 pro reverb, 2nd Chanel working only,no reverb working,vibrato just working, normal Chanel very faint, mate if you lived here in Australia I would ship it straight to you for repairs,can't win them all I suppose. Anyway thanks again for the great vids, cheers greg
You're welcome, Greg, and congratulations on a nice acquisition. I wish I were nearby to help. If I were there, I would first focus on the reverb and tremolo tubes.....perhaps replacing them or exchanging them within the amp to see if change occurs. I too recently had a problem with extremely weak reverb in a '74 Deluxe Reverb (the circuit is identical to yours). In this case, the tubes were fine, but one puny .003uf capacitor (carrying reverb signal to Reverb pot) caused the grief. Still, the tubes are always the best place to start. Also, you probably know the old trick: rattle the tank. If the spring noise from the speaker is loud it's probably the input that's bad. If weak, it's probably the output. In my case, it was weak. Good luck !!!
Doug, I'm so glad you make these videos. I'm working my way through them, and learning with each one. Thank you so much.
You're welcome, Rod. I hope the videos are helpful :)
I have absolutely no comprehension of the mysteries of electronic circuitry, but I thoroughly enjoyed that!
I'm glad you enjoyed it, James :)
Uncle Doug, you are so awesome!
Replaced the ignition switch and key on my streetbike based track-only race bike. Chrome toggle switch on a hand-formed aluminum mini panel. Two options: On and Not On.
Inspired by, and in tribute to Uncle Doug!
We are flattered to be part of your race bike, JZ. Best of luck with it :)
My god this is good. Off is trite, so are fender champ chasis...you are a master smart aleck and I know a former Hellraiser when I hear him...I've already had a good laugh today! Good to know you are there guys! Have a great day everyone!
Thanks, WTD. Rusty and I have calmed down considerably from our early days of biting ankles and chasing UPS trucks. That early foolishness no longer seems appropriate at our advanced ages :)
I am an electrical engineer become chiropractor, and amateur musician all along. You have inspired me to get back to my roots; I'm going to attempt an amplifier design after watching many of these videos. Looks like a lot of fun!
That's great to hear, JW. Best of luck with your rekindled interest in electronics.....may all your projects be successful :)
Reply to Not Me: Part of learning any new skill, NM, is the ability to think and work with increasing independence....taking responsibility for your own learning. If you wanted to learn how to play golf, would you be better off having someone play 300 holes of golf while you
watched.....or having someone explain the basics of golf and then allowing you to practice, learn, and develop your own skills over time. The first method is utterly passive and appealing because it requires no effort. The second method requires participation, focus, personal responsibility, and hard work. As a long-time teacher, I can tell you that only one method works.....and it's not the first one. P.S. Your reply would work if you simply altered your privacy settings to allow people to respond to your comments.
I am very sorry to hear of your failing health, NM. Have you considered buying an amp kit to build? You will receive all the necessary parts, excellent instructions, and tech support if you need it. The Weber kits are particularly good. Best of luck to you.
Uncle Doug help
Uncle Doug, love your videos!! When you showed the remnants of that Precision signal generator you brought me all the way back to 1968-1972. We used that exact signal generator in my Radio-TV shop classes at Wm. E. Grady Voc-Tech HS. You’d think by now Rusty would have gotten used to GLORIA by now!! Lol Thanks for such excellent info...👍
Dr Doug .. I am glad to find this learning Exp in watching you Build this piece fender champ aint got anything on you .. I have found the Piece I am interested in .How do I contact you about recreating this piece for Purchase ? With a 10 " Jensen . I know nothing of electronics . please let me know thankYou .
Awwww, Rusty♥️ he just added that little comedic touch! Good thing the kitty squad was able to step in and take up the slack. Still, in all, these videos are a treasure of knowledge! Thank you for these, Uncle Doug!
Agreed, Curtis. Thanks so much :)
Excellent video. There's a company selling a kit to make this amp (I'm sure you know of it), but your video will show me how to make a much improved version for less money.
Thanks for sharing your knowledge.
+AgentJayZ You're welcome, JZ. I believe there are several kits available, which are great for first-time builders, but building from scratch is less expensive and an interesting challenge for those with more experience. Good luck with your project.
Thanks for this video , even though I wasn't building an amp I watched , just to learn a little more and it gave me an ideas. My amp , a 15w solid state , was making all kinds of hum and horrible high pitched noise. I noticed you twisted some wires , all the alternate current leads I believe , together and ran them high instead of a long the bottom of the chassis. That gave me an idea and I tried the twisting on a few wires. Presto , it sounds %100 better. Not sure why but it also works on input and speaker wires. Anyway , thanks Uncle Doug !
The winding of AC-carrying wires is always a nice touch, Travis. Glad the video was helpful.
Im glad I watched and feel like I might learn something if I aint careful. You put it in ways I can understand it. Thanks, Merry Christmas.
Thanks so much, Grady. I hope you learned a lot :)) Merry Christmas to you, too.
Congratulations to you Uncle Doug.You may be happy to know that I built a 5f1 amp out of a Hammond ao39 chassis,power transformer and tubes.I drilled a hole for a 6v6gt and followed your videos and a 5f1 schematic and I am happy to say "IT PLAYS" and you are awesome...DUDE! Thank you for teaching us.
+Tom Ward You're welcome, Tom. Congratulations to you on your successful amp build :)
Hi Uncle Doug!! I´m looking forward to learn about electronic just to understand and be able to build up my own amps and stuff.....Your videos are so helpful and clear. Thanks for dedicate the time to register this material. Greetings from Argentina
This is a perfect example of where modern electronics fail, With a little imagination and lots of know-how, you went from a pile of bits to a very nice sound amp! I know nothing of vintage tube point to point electronics, however, your wiring job is so clean and well-executed It makes me almost think, even I could stand a chance of making one.
I think you could, too, Pat. Study the videos, buy some components, and give it a try.
Thanks you have inspired me to make my on guitar amp.
Thank you, thank you, thank you!
I built one of these about 2yrs ago. Put it away and forgot about it. Got tired of playing violin and decided to dust off my guitar equipment. An idea popped in my head to swap out the RCA output plug for a 1/4" jack setup. For some reason my brain took a vacation and I couldn't figure out wiring. Watching you talk about your impedance switching mod and showing the schematic....DING!!!...The light came back on!
Excellent job on the amp!!!...After looking at yours I might go back and do some housekeeping...I feel guilty after seeing your tidy work...
You're welcome, MS. I'm glad the video rekindled your enthusiasm for your project. Thanks !!
I don' see as a mess that is a beautiful place to enjoy building stuff ^_^
Thanks, Juan. Rusty and I really appreciate your kind words. I guess a messy workshop just shows that lots of work has been going on :)
me too bro every time I work on my solid state amplifier build I made a lot mess but I love it ^_^ lol
Hi Doug , I had a bit of back and fourth with you some time ago , your videos have inspired me, I did the Vox v15 and then I wanted to make one from scratch . I made the chassis soldering the galvanized sheet after bending and the cab is a wine box and some old wood i had lying about . Long story short without you and your kind and patient explanation I would have just never done this . I have a bit of mains hum but I know why this is and I can live with it . Again you are the man and you have a special gift when it comes to teaching you just seem to know what the questions will be and how good it feels to know very little and have things explained in a simple yet detailed way and the light turns on . Respect .
Nikk
ua-cam.com/video/Ix3L1SAR5_Y/v-deo.html Sorry about the sound quality
Thanks so much for your very nice comments, Nik. I'm really glad that the videos were helpful and your project turned out so well. Please keep up the good work :)
Thanks great vid on negative feedback etc
I'll be damned...I built one of these from scratch about a year ago, my first tube amp build (I don't play guitar, but my brother was going to take lessons and wanted a small amp) but the thing was plagued with an annoying 60hz hum I couldn't track down. I was routing and re-routing filament wires, even tried shielding them. The fix was your two resistors to ground trick. Thanks!
Yes, the old "virtual center tap" trick is a great hum reducer. We're glad it solved your problem.
Thanks for the videos and great commentary. Normally I'm not of fan of commentary but yours is informative and clear. I look forward to checking out some of your other vids.. Thanks Uncle Doug.. subbed!
You're welcome, Elams, and thanks for the kind words. I'm glad you enjoyed this video and thank you for subscribing :)
You do great work and explain things very well. I've been building guitars, amplifiers, and recording stuff for almost 60 years and yet I learn things from each one of your projects and presentations. I'm envious of your great work habits.
Best wishes.
TheTrackingstation Thanks so much for your very kind words, TT. Coming from someone with your extensive experience, this is very high praise and I sincerely appreciate it. I'm glad the videos are helpful. Thanks for watching :)
On/Not on! I liked that :)
Most people missed it, I guess, Kax. Glad you noticed :)
i also like how not on is up and on is down :)
@@UncleDoug just making sure we're awake?
I've been wanting to build a tube amp for years but never have any money to do so I feel like I can salvage my parts now (your video on power transformers was the greatest thing since sliced bread) THANK YOU ROCK ON DOUG YOUR THE MAN!!
Sandy Shuman, your comment came without a "Reply" capability, so I'll answer it up here and hope you see it. This issue was brought up by a viewer, who recommended that the NFB loop need not be switchable, but simply connected to the 8 ohm output tap of the OPT. The problem with "switchability" is that it alters the amount of NFB, rather than simply applying it equally to either output.
Uncle Doug
Uncle Doug hey uncle Doug I'm 48 got int the trades as a broom pusher for an Electrical shop in Downey Ca. At the age of moms saying get a job or stay in school at the age of 15 Long story short quit school there was sum ditching involved too this career that was chosen for me was a blessing . Sooo it wasent till the latter part of my career that politics split our electrical shop in halph so always yearning for electronics I went that way. Is there a way I can get ahold a yah. I purchased a whole lot of tubes Heathkit CB units marine also and tons of personal board designs from a Japanese man that retired from skunkworks in 69 so I realized not the value but the history with tons a top grade military and top a the line consumer manufacturers tubes resistors wax caps and on and on
Looked on ur UA-cam videos n really can't find a way to contact u.can you please if u look at ur comments reach out for a father son conversation. To help me more of sum of the things I aquired for givin up 6 of my 1887 uncirculated silver dollar coins
Take in mind this guy had a big lunch box and had aquired his two garages full of military grade electronics stuff thru his career so
My first ever shakin at the teeth saying Wat would it cost for everything
Paintings n cool American Japanese historical things
U can reach me at rlrojo @mail.com
B was Ruth ur while or I'll pay for ur knowledge try ray
You should start your own merch line with t-shirts that say "I learned everything I know about tube amps from Uncle Doug." But seriously, you've been a big help as I've knocked together amps from old parts over the last couple of years, so thank you and keep up the great and informative work!
You're welcome, Mutt. If my partner had his way, the shirts would read "I learned everything I know about tube amps from Rusty the Wonder Dog" :) Thanks for watching.....and for your kind words. ^. .^
I realize the comments are ages old, but a T-shirt like that would be very cool!
I found the Scratch Built Fender Amp very entertaining and educational.
I'm not in the least bid electronic, but found myself biting at the bit to try!
Great job and very nice sounding.
Ken Henry Thanks, Ken. Glad you liked it :) Please consider building your own some day.
Thanks for your vids. I added the two 100 ohm resistors to ground from the filament leads on my 1956 Ampeg Guitaramp. HUGE difference in background noise. I also found a single green and white wire coiled under the power transformer that appears to have never been connected to anything. I ran that to ground and the noise dropped FARTHER. Nice and quiet amp now.
Nice work, Larry. Best of luck with the amp and future projects.
Thanks for the clear and concise description of this build, it gives me a bit more confidence knowing what to expect when I build my very own amp.Great stuff!
Glad you liked it, Giulio. Same to you :)
@@UncleDougJust a few more visits to the re-cycling yard and my 1st amp will be ready. I actually found a rusted chassis from a very old Deluxe amp , had to replace most of the parts and learned via Trial and error and sweat how to get a noise out of it. It's basically a Radio without the reciever and I wired the cable straight to the CTS volume pot (no tone yet). Have to thank you cos a year ago I knew how to put circuits together but never really knew Why they worked, thanks again.
I knew a tech who told me this. He charged $100ea to do this...He said that transformers are not perfect. That you should measure the outputs on the transformers, For example. If you have an output of 5 volts on one and 6 volts on the other you should attach a pot to the 6 vol and decrease it to 5,. he call it phasing the tubes. I heard the difference. It was amazing.
You are truly a Genius. I envy you so much. Thanks for the fun : )
+David Olenick You're welcome, David. I'm glad you enjoyed the video :)
Those variable resistors for the feedback and cathode resistor is just an awesome idea. Well done
Thanks, Robb.
Hey Uncle Doug & Family, I hope you are all doing good. Always the best in tube amp videos, thankyou for your time, effort & years of experience which you so kindly share. Don't really do holidays any more, but, would like to wish you and yours all the best, every happiness, and, a Happy Year End!. Take care, be good, Cass.
+Cass Virgillo Greetings, Cass. The whole gang here at Uncle Doug's madhouse and menagerie sincerely appreciate your kind comments and holiday good wishes. We all hope you have a great holiday season and a happy, tube-ampalicious new year :)
That's pretty slick man. I would have never thought of rigging a negative bias that way. Thanks for the insight.
You're welcome, ESB.....glad you liked it :)
Thank you Uncle Doug fortaking the time to create another great set of videos! Your work is very much appreciated (: ~Jason
You're welcome, Jason :)
Thank you for your insights and patience, I always learn something while watching your videos. Cheers, Perry.
You're welcome, Perry. That's good to hear :)
This is great. I really appreciate your clear descriptions of signal flow. Thank you.
Thanks, Dr. S. I'm glad you enjoyed the video. I have posted almost 90 other videos which may also be of interest....:))
Haha, Not On is absolutely brilliant! I may have to steal that Doug!
Thanks, BC. Don't forget our royalty of 5 dog biscuits for each use of the phrase ;)
Hi Uncle Doug & Rusty, He sure seems like a good 'ol boy, I mean the dog, and, you to Uncle. I am so glad I found your channel, a wealth of information. It's on my list to scratch build a tube amp that rocks. I built a current limiter as per your video and it worked perfect. All I could get for now was a 250W heat lamp with a resistance of 5.0 ohms. I shorted through a $20.00 DVM and it still works perfect, thankyou. I am subscribed and check all the tutorials I can. Take care, be good, C.
Cass Virgillo Greetings, Cass. It sounds like you are making good progress on your way to building your own amp. Thanks for watching and subscribing, and best of luck with your projects.
Very enjoyable. No wonder we now have a flood of small amps that are cheaper than the equivalent kits now we can see just how simple a tube amp can be.
Good parts are still expensive, David, but high quality vintage parts can be harvested from dirt cheap sources.
Great series on what to do with the bits and pieces that are laying around. You really did great job on this project! I left off last night with the completion of the cabinet. I watched the cabinet build and I thought about how cool it would have been to build a cabinet along the lines of an Ampeg B-15 Flip-Top for this project. This amplifier would be perfect to emulate that style.
I was watching this when you replied to me last night about my Hiwatt. I'll be opening it up in a few hours and thanks to you I have a good understanding of both the technology of the amplifier and a good plan laid out.
Thanks and all the best!
jcmcclain57 You're welcome, JC. It's great to hear that the videos are helpful. Best of luck with your Ampeg B-15 project.....let us know how it turns out :)
Nice tip. Making the virtual center tap I would have never thought of. Nrgstive feedback is common on amps. It puts a negative or opposite of the sound wave distortion. Thus it cuts the the distorted part of the wave more because it is at the top of the signal. Adding tone controls is a no brainer. I would sdd those. All in all, good job!
Thanks, John :)
many thanks Uncle Doug for this video, wich was very informative, again ;-) I'm restauring a stereo amplifier from the 1960's, and was wondering why the input transformer has 2 resistors wired on the 6.3V plots...thanks very much for revealing this "virtual center-tap" trick ! thanks to your videos, I'm knowing what I'm doing, instead of simply changing parts, and making an old electronic running. best regards to you, and a hug to Rusty
+Patrice CHARPENTIER You're welcome, Patrice. We're glad the video was helpful. Best of luck with your project :)
Thanks Uncle Doug for all the great tutorials, they're really helpful. And love your dog Rusty, funny how he always slips away when there's works to be done LOL
You're welcome, TT.....glad to hear that the videos are helpful. Yes, Rusty is much like having a teenager around the house.....disappearing whenever there's work to be done (as you said) :)
I can't believe that you made that from scrap parts amazing
Really cool
I have great respect for you and what you do and show people
Excellent work
Thanks so much, LJ. I'm glad you are enjoying the videos :)
I am get all motivated to try building one of these when I watch this video.
Give it a try, HA. It's a great hobby :)
Well, Jack can probably relax now. I have made it to the video you referred me to. And, it dawned on me that a few years ago I restocked my 1/2 watt resistors, and do have some other new parts in my parts boxes. So, took the plunge and ordered up some transformers and a few other bits. I had some cabinets built and stored too, but I am going to go in a different direction now after watching many of your scratch builds and vintage amp repairs. Maybe a SILVERTONE MODEL 1391 style, with a bit of my own flavor. You are an inspiration. Look out for my upcoming house fire video.
Thanks, AZ. Good luck with your project.
Ah, I see that now! Don't know how I overlooked that, it's even in the AB schematic. Thanks again Mr. Doug!!!
+Dean Rohleder You're welcome, Dean.
Hi Uncle Doug, good stuff, home grown. It could be a Proto type or even a Master Seargent himself that had fun all day long at work.
and saved the day for good friends and buddies who did the same in return. Love the stuff... The Old timer himself Eddie.
Thanks, Eddie :)
I just watched this
Video again can't
Get tired of it
Again nicely done
You are a very fine teacher. You are
Probably becoming
None around the world
Of those who like
Electronics projects
I still like your funny
Sarcasm.
Dwight.
Thanks, Dwight :)
@@UncleDoug Your
Welcome Uncle Doug.
Dani Sonic. If you put out anymore vids I'll
Be watching. I can not afford any financial support but I can promote and share. I have allot of bills to
Pay. Thank you for who
You are. You make the world a little easier. We need more like you
Keep sharing we will
Thank you for it in one way or another
Your friend. Dwight
Allenpark,mi.
@@dwightjt Thanks for your nice comments, Dwight.
Hey Uncle Doug, that's what my dinner table looks like after, during, and (EMBARRASSED) yes before I replaced a simple piece of any works, I believe it's a sign of locating what you need, when you need it,or so I tell em!! LOL
Greetings, Nelson. If your dinner table is anything like my workshop (in the video) then you must be losing weight......because you can't find your dinner :))
Very inspiring. I'm preparing a similar project. Using 5F1 schematic but adding some extra features like bass, mid, treble control, line-out, master volume control and etc..
+Congi Thu Thanks, CT. I'm glad the video was helpful. Best of luck with your 5F1 project. Please let us know how it turns out :)
Planning stage. I would like show you the modified schematic when It's ready.
You're welcome to post it on my Facebook page: Uncle Doug's Vintage Amps.
Thanks! I became your fan!!
You're welcome....glad you joined our YT family :)
I made the same! thanks, I took lots of references from your videos! I made it under 30 dollars, I found the power transformer in a Junk Yard in perfect conditions and some components from a vintage stereo console! greetings from Chihuahua, Mexico!
You're welcome, HR. Congratulations on a successful build at a very reasonable price. Who says that amp building has to be an expensive hobby ???
Exactly!! it's my first amp, and I will try to make a little cabinet for it, and also a little overdrive pedal.
I can tell that you are excited about this successful project, Heriberto, and you should be. When completed, please post photos of it on my Facebook page: Uncle Doug's Vintage Amps. We would love to see it.
Uncle Doug Yes, I am really excited! Absolutely, I will post it! thanks for your videos, they are incredibly useful!
Hearing from successful, enthusiastic viewers, like you, makes it all worthwhile, Heriberto.
Good ol' Rusty. He's such a good sport to help out.
I'd be lost without him, CS.
Great job! Love. Your videos🙂, is so funny when you dogs runs in the end LOL
Clear and concise. I believe that's correct. my new favorite channel.!
Thanks, Bryan. That is exactly what Rusty and I want each of our videos to be. Welcome aboard !!
After my Tweed Deluxe from a Thomas organ chassis project, this shall be #2. I have a cute little Yamaha "Budokan" combo cab with speaker that I ripped the el-crap-o amp circuit out of. I see a "Budokan No Chanpu" amp in my future. Thanks for the tutorial; your stuff is slowly percolating into my somewhat challenged brain.
You're welcome, JC. Your next project sounds both interesting and well-named. Best of luck with it !!! :)
Rusty is far too cool for school! I like the way he cuts and runs when it's time to clean up...no steak for you Rusty!
It's like having a teenager around the house.....huge appetite....not much help with chores, but he's still a lovable rascal.
Just saw the "On" & "Not On" . Woke my wife up as I was laughing. She looked at my PC & said "that guy is probably just as weird as you are". I thought, "Yeah, probably" :)
Great minds think alike, Mark ;)
Great video. Re: NFB. Your resource was the only one that I found that was helpful to me... I've got my Champ running the way I want it. Thank you.
You're welcome, Rik. We try to be practical rather than purely theoretical. If you haven't already subscribed, please do so. We've posted almost 150 videos similar in style to this one.
Great video as always. Love to see the cab construction and tolexing video as well!
Thanks, Kevin. I will head over to Home Depot in a day or two to select some nice pine boards. Happy Holidays !!
great remake with a twist that improves it massively the negative feedback loop is a great addition great post doug regards jamie..,.
Thanks, Jamie.
thanks Uncle Doug~ extremely inspiring thinking.. and your guitar sounded GREAT! rock on~
Glad to hear it, GB. Thanks !!
I have returned after 2 years of rukus to find this video. The NFB is a delight. I have a Kustom Defender 5H with a EL84 instead of my fave 6V6 any way I had to find a Russian site and translate it to get all the mods Tone stack and Master vol) . The one thing missing was the NFB. Turns out the Defender 22K to the second section 12AX7 Cathode made it silent there is no joy in Mudville. So, I put a 500K in series with the 22K and the vol was still low so I think a 1 Meg pot + a 100K might do it. . I enjoy your videos and have learned so much. Thank you for all you do. Hope you are well.
You're welcome, Barney. Yes, we are all doing quite well indeed. Thanks !!
@@UncleDoug LOL if you want to have a chuckle, here is the Russian site for the Kustom Defender 5H. The translation is not so good. :) forum.guitarplayer.ru/index.php?topic=158288.30
Effectively they are saying for the Kustom Defender 5H, is; remove R3 the 0 zero ohm resistor and insert the Fender tone stack into the two empty holes. . Treb lead to the top hole, Mid lead out to the bottom hole and ground to ground. This bypasses the stock PCB tone circuit. Fender tone stack (Bass 250K pot treb 1Meg pot mid pot 200k, Bass cap .047Uf, Mid .022uf, Treb .220nf + 68k joined lead out to solder point connection. (treb cap-resistor in parallel. ). Also remove R15, R16, C15 (above the stock vol pot) .............(it's the stock tone circuit) ................................................................ Then for the Master Volume to the EL84 power tube, remove R4, R16 and R17 (voltage divider) and replace with a 1 meg pot (voltage divider) Wiper wired to top of R4, lug 1 to top of R17 hole, and lug 3 to top of R16 hole ( ground)... The amp is a boutique niche that only 1% of guitar players will appreciate , especially 1920-1950s blues fans. Its a screaming Bearcat when pushed, Its a nice tinder box at low vols. This Amp can be had for $89 on eBay. It's a great learning platform. I would like to calc the math on all the circuits. Thanks uncle Doug, I think you have all the videos for me to calculate the math.
Other than the snazzy Russian babes, the site was Greek to me, Barney. Thanks for the translation and good luck with your calculations :)
Hi Doug! Interesting little modifications! The variable negative feedback is an excellent idea...I've never seen this commonly on commercially made amps, but it's valuable for many reasons! Creating the virtual center tap is a very wise choice here...I've done this to many amps over the years...many of the amps that I've worked on which had no CT on the PT greatly benefited the addition of the resistors! I had one issue where no matter what I did, I couldn't get rid of the AC heater hum. Well, after running it by a few seasoned senior techs, I was given a hand-drawn schematic for the modification...Been using it ever since! Keep the good videos coming! PS: I see Rusty tends to run for the hills when it's shop-cleanup time :)
It's great to hear from you, Frank. I'm glad you liked the video and the modifications. Rusty and I send you our best wishes for a great Christmas season !!!
Another great little video series!
Thanks, Robert :)
This was a fascinating watch. In order to accomplish this task one must have an extensive background in electronics. This was a very well made little amp.
Thanks, TF. With some study and practice, I'll bet you could make one too. Perhaps you could start off with an amp kit and learn the basics. It's a very interesting and rewarding hobby.
Uncle Doug
That sounds like a great idea. I recall a company called Heathkit years ago. They sold many kits of various appliances, and some were rather good. I think I'll take your advice. You sure seem to make it look easy, though.
Take a look at the kits offered by Weber: taweber.powweb.com/store/kits.htm They are of good quality and would be an excellent learning experience. Good luck.
Uncle Doug
Thanks for sending the link, Doug. I'll get on this for sure. At my current age a new learning experience would definitely be an "experience". But it would be well worth it.
Fantastic! I'm putting together a 5F2A Tweed Princeton and this was very helpful. Some cool mod ideas that I will explore. Thanks!
+Kley De Jong You're welcome, Kley. Best of luck with your project.
how awesome. im 6 years late to the video AND ITS STILL CHRISTMAS SEASON!
It's always Christmas on Uncle Doug's Channel, Rocko :)
Thanks so much for this series uncle doug!!! I have gone from knowing not a thing about how these amps work to almost knowing how to build one, the electronics still confuse me a bit because I know nothing about them, especially the schematics that's where it loses me the most but the cabinet building I can do as I am a joiner/cabinet maker myself and will be constructing my first guitar speaker cabinet tomorrow. I will be looking more into the amp building side of things and reading a few books and I might just give It a go to see what I can come up with! Thanks again these videos are incredibly informative!!
You're quite welcome, Brian. We're glad the videos are helpful. Best of luck with your cabinet project and all subsequent projects :)
Thanks so much, Thomas. I'm glad you like the scratch-built Champ. Please send me a private message and we can discuss it.
It sounds like you have quite a nice collection of vintage amps, Thomas, and I am pleased that you like the scratch-built Champ. If you'd like to discuss a purchase, please contact me by Private Message. Thanks again for your interest and input :)
Uncle Doug, you are by far the best amp scientist on the you tubes... btw, I think I might have opted for the off, not off power switch label
Thanks, V. That was my second choice :)
A work of art. Shame to hide it in a box. I liked the lower value nf. Even though I'm a Fender player, (and hate humbuckers), I like clean, mid-rangy amps. An inexpensive, worthwhile addition. And a remarkably simple circuit. Most edifying, sir.
Thanks so much, Bill.
Great as always! In the last couple days I made kind of a champ, but mostly based in the 5c1 schematic, with penthode preamp and no feedback resistor. The penthode in the case is an ef184. Also made a tone control. The output transformer was a 7,5 volt line transformer that I reconfigured for single ended use. Overall, it costed me about nothing, and sounds great
Congratulations on a successful build, Jose.
P.S. been meaning to tell you that your handmade pieces are beautifully artistic. Outstanding work even as non-functioning installations...but function they do. I don't know for sure, but I suspect this is what shinola looks like...can never get a clear answer from anybody on that one so I am forced to make a call... shinola. Later on Uncle Doug...
Thanks, WTD. Shinola it is !! :)
Heh, thanks for that annotation, that bit about the negative feedback going to the 6v6 almost made me question everything I know.
You're welcome, Morgan. Without any verbal-editing capability, I have to rely on notes to make corrections. I apologize for any initial confusion.
A bit of a related question: On both the Leslie 122 and 147 amplifiers, the plates of the 6550s are linked back to the grid with 56k resistors and coupled with 100pf/1000v capacitors. Do you think these may be negative feedback loops?
I looked at a schematic and must agree that it does appear to function as a NFB loop. This circuit would inject a fairly high frequency (the portion of the signal that can pass through the 100pf) out-of-phase signal back to the grid, which would neutralize some of the high frequency portion of the incoming signal. The overall effect would be to reduce shrillness perhaps (?).
Your videos are outstanding and greatly appreciated! All the best - Luther
You're welcome, Luther :)
You're the greatest thing since the Navy published NEETs.
Thanks :) High praise indeed, AO. For those unfamiliar with the term, NEETS stands for Navy Electricity and Electronics Training Series which is an exhaustive manual on all aspects of electronics theory and practice.
That thing is killer!!
Amen, Grant.....especially considering the parts it was built from :)
I really enjoy your videos. The 5f1 is my favorite amp. Such a simple circuit and I love the tone. I built the 5f1 (with ClassicTone, my go to transformers) as my very first amp and still that has got to be my go to amp. Really good video.
Thanks so much, Jay.
@@UncleDoug i was wondering if you could make a video on grounding. I have heard of what Kevin O'conner, writer of TUT, calls galactic grounding. Essentially (from my understanding) where a buss runs along and connects at one point on the chassis. All the grounds are connected to their respective filter caps in their circuit blocks and runs along like a river then tributary analogy so that it "flows" along a chain and minimizes ground loops. Basically the whole "circuit" minus the mains is connected to one point on the chassis. Power mains connected to the chassis near the outlet for safety. I think I understand it to some degree (as in knowing what to "do" to build a relatively "quiet" higher gain amp, but at the same time not really understanding it). Currently reading Merlin Blencowe's book which explains his method of grounding. I think alot of amp diyer's can benefit from a video like that especially with the simplicity that you explain things. I have seen alot of people ask and talk about this topic considering grounding IS a part of the circuit.
Hi Uncle Doug! Inspired by your Champ videos I decided to build a 5e1 clone myself. As it was my first full tube project I wanted to built it into a bigger chassis than the original. That made also possible to use bigger transformers so I used KT66 tube. I added also a bias potentiometer so I could use 6V6 with it too. It sounds amazing. Best clean tone I've had.
Olli Kivelä Wow, Olli....Congratulations on a great first-time amp-building project :) Your modifications make good sense and the fact it works so well is evidence of your skill. Keep us posted on your next project(s).
Really beautiful work. It's cool to rummage around in a bucket of old parts and make something of real use out of it all. Very cool brother!
+alphabeets Thanks, AB :)
Sounding was great uncle doug..sound magical!!!
Thanks, Jason :)
Very cool, wish I had cool junk to convert like that
Thanks H&K.....you have to admit it's a creative way to clean up the workshop :))
Very, I could imagine the endless projects you could have laying around in the junk pile.
Absolutely an awesome job on that amp ! Really enjoyed watching
that video ! Impressive !
Thanks so much, Kal. I'm glad you enjoyed it and hope you also enjoy this great holiday season. Best wishes to you and yours.
Having a switchable off NFB option works fine, just gives you extra gain and drive.
My last build I made the V1 cathode bypass cap switchable, which makes for usable clean tone with the little bugger flat out.
Greetings, Squizzy, and thanks for the good suggestion. I may try that in a future chassis-construction project. I really appreciate your interest and input.
I have never built an amp before, and I am going to start with this exact design! I've had lots of people tell me that it is a great idea to start with a Fender 5F1 Champ for a first amp, because it has so few variables. One thing that I see being a problem is that you used parts that you found, and I will need to order new parts. I don't have the experience yet to sort out which power transformer, output transformer, etc... but I hope the ol' internet can help me with that. I love the NFB loop dial. That is so clever. Also, the variable bias resistor that you can dial in with a screw. I don't know if those things are easily available, but I'm gonna try. Being so new, it is also hard to find a reliable schematic to go off of. There are literally dozens and dozens of Champ schematics out there, but I can't tell just by looking at them if they are accurate or off, and if they are off... off in what way, and by how much. Ha ha ha. Oh well... gotta start somewhere. Thanks for the videos! You should DEF. have a patreon page or sell your amps or something. I'd def. contribute or buy one of your refurbs, if for nothing else, just to say thanks!
Greetings, Michael, and thanks for all the nice comments. I do have a Patreon page and accept PayPal donations to account dldcam@aol.com. The schematic you are looking for is here: i0.wp.com/myfenderchamp.com/wp-content/uploads/2010/03/champ_5f1-schematic.png You can order your parts from Antique Electronic Supply and your transformers from Amp Parts Direct: shop.amppartsdirect.com/main.sc They offer transformer sets for the 5F1 Champ. Good luck.
I just built a 5F1 with a StewMac kit. It’s bog standard, and much less cool looking than this one. But it has every piece you need, and amazing instructions. If you want to go that route, I’d recommend the StewMac kit.
Thanks for the video.
I have a pkexi style preamp with ac15 power amp and no negative feedback..
I will try to implement it, if i find i nice setting i can make it permanent. But i guess for cleans its good to have no nf, more bass more highs.. And for overdrive more nf, to tighten the sound.
I will try.. My amp sounds a bit muddy, this will help i guess.
Contrary to what people say nf enhances touch response snd dynamics. I tried it in my 5e3.. Much better with NF... Can go from clean to dirt just by pick attack..
Your way is perfect for tuning an amp. Thanks alot. Ine needs to listen in real time. If you solder and start amp again you forgot what it sounded before. Direct comparision is so valuable!!
Nfb pot, presence and resonance control would be max fine tuning..
Do many ideas thanks
Thanks for your comments and input, Joe.
Great build! I'll have to try the virtual center tap on a Kalamazoo Model 1 I have that has some real annoying hum that I haven't been able to sort out as of yet. Thanks for the clear explanation.
You're welcome, FH. I hope the virtual center tap trick works for you. Best of luck :)
Thanks for the videos and sharing your knowledge. It seems that the tubes used in this amp were really popular...the 5Y3, 6V6, and 12AX7's seem like the standard for a lot of small amps. I think I'll use this circuit to make a small amp. I have an old wooden Philco radio cabinet that this would be perfect for!
You're welcome, 74D. Yes, those 3 tubes have been the basis for countless amps over the years. Good luck with your project.
Uncle Doug thanks a lot!
Very helpful video for me. Thank you.
We're glad to hear it, OT.
Uncle Doug did you realize that you had more high at 10K…I wish you did put it full volume at 10K to hear the high notes how they sound ! :) Again thank you and Rusty for the beautiful and educational video ! Keep on the good work ! :)
+gerard cousineau I wish I had also, Gerard. You're welcome. Thanks so much for the very kind words :)
i love your videos, brother. you remind me of a age of nostalgia.
(back to the memory/love lane)
John Singh Thanks, John. I think a big part of the interest in vintage amps is the pleasant memories we have of the times back when they were new.
You know the saying brother.
What is old is new again.
Theirs nothing new under the Sun.
It's a very nice and hot sound indeed, congrats and thanks to share this beauty
Thanks so much, Rene. Please also watch the videos in which I build a cabinet for the little jewel. In addition, I am now working on a video showing how to cover the cabinet with material (like Tolex). It should be posted soon. Stay tuned :)))
Realy nice job! Simple schematics and a nice sounding amp.
Thanks so much, FMS. I'm glad you liked the video and the amp :)
Great video. Really like what you're doing here. The variable biasing resistor on the output tube is a nice idea.
Thanks so much, Tony. Glad you liked it :)
All these amps are awesome. Great work.
Thanks, Jasin :)
I need to get you to build me one of these. Just as simple and "road warrior" as it gets. They're like pieces of art that actually function.
I'll bet that if you watched the videos and paid close attention, you could build your own, Jasin. Give it a try and see.
Love to see your projects, I have just started building my own effect pedals, so this is very interesting to me. I think it's going to be a while before I'm up to building anything like this tube amp, but I have learned a lot from your vids, thanks for making them!
You're welcome.....glad the videos were helpful :)
the coolest video on youtube. Worth every minute. Thank you
Thanks so much. I really appreciate your kind assessment. I have posted 80 other videos and would like to invite you to check them out. Happy New Year !!!
Hi uncle Doug, I finally made the move and ordered all of the parts for A scratch build. I'm planning of building a 5C1 amp as suppose to the more popular 5F1 . I have a few questions I needed to ask you. Is there anyway I can send you a PM. I already ordered the parts and had bought the pine boards at hOme depot earlier. How is the 5c1 differ from the 5f1 . I watched all of your videos regarding biasing a single ended output amp like the champ. I am looking for a really fuzzy little amp ( early breakout) on lower volumes. Thanks
John
Congratulations, John, and best of luck with your project. I can tell you the difference between the two circuits, but it would improve your understanding if you downloaded the schematics for each and made the comparison yourself. The 5C1 is a great choice, in my opinion, because it has a 6SJ7 pentode pre-amp tube (instead of the more common 12AX7). Pentodes generally have a warm tone and should give you the breakup you seek. You should also watch my video on the Tonemaster amp.....it has a virtually identical circuit. I'm not sure how PM's are sent on YT any more. Every time I figure things out, they change everything....:))
If only I lived in the US... I’d love to buy one of these home brew creations by you :-)
Thanks. I'd love to sell you one, but, as you realize, overseas shipping would be tough.
Uncle Doug! Your video's are brilliant. Helping me understand valve amps a little more.
cheers :)
***** Thanks, Sean.....glad you are enjoying the videos :)
Thanks Doug for great little vid, I was just GIVEN a 78 pro reverb, 2nd Chanel working only,no reverb working,vibrato just working, normal Chanel very faint, mate if you lived here in Australia I would ship it straight to you for repairs,can't win them all I suppose. Anyway thanks again for the great vids, cheers greg
You're welcome, Greg, and congratulations on a nice acquisition. I wish I were nearby to help. If I were there, I would first focus on the reverb and tremolo tubes.....perhaps replacing them or exchanging them within the amp to see if change occurs. I too recently had a problem with extremely weak reverb in a '74 Deluxe Reverb (the circuit is identical to yours). In this case, the tubes were fine, but one puny .003uf capacitor (carrying reverb signal to Reverb pot) caused the grief. Still, the tubes are always the best place to start. Also, you probably know the old trick: rattle the tank. If the spring noise from the speaker is loud it's probably the input that's bad. If weak, it's probably the output. In my case, it was weak. Good luck !!!