It's in my head. And it goes something like this: Fender: standard charge Gibson: standard charge Ampeg: standard charge Marshall: slight upcharge if it's a DSL or TSL Mesa Boogie: i'll disassemble it for FREE!
@@drdrums1 well it's basically standard charge for simple amps, ones that don't have like complicated PCB layouts and stuff, most vox's would fall into that category. I think...
As someone who was friends with Ken Fischer since 1988, I can say with certainly that Ken would have been very impressed with you, Brad. He was one of a kind. Sure miss him.
My son recorded his bands first 2 albums with a 66 Black face Bassman that my daddy had bought for he and I in 74. He then let Chris use it for recording .Tragically it wasstole stolen from the storage unit they shared with The Kentucky Headhunters. Learned to play a lot of ZZ Top through that amp.
I remember I built a Blackface Deluxe Reverb and when I finished I had some noise and squeal when the amp was turned up. I tried lots of things...in particular I cleaned up my grounds and some of my wire routing and length and couldn't find it. I changed out a few items that I though would cure it, but had many hours of trouble shooting and couldn't figure it out. I ended up buying an Oscilloscope. I checked the signal at the output and could see the wave form get these weird spikes, (that I guessed was parasitic oscillation). I ended up looking at the wave stage to stage. 1st stage was fine - second stage was fine, etc. I forget the exact spot but it was somewhere after the second stage and it was right near around the trem circuit. Turns out I had scrounged up one resistor from my box of parts that came from an unknown source, but was my only one of that value I think it was the 4.7M resistor coming off the reverb feeding the grid of the next stage. Yanked that resistor and put in a new one and bingo! That was my first experience with a signal generator and an oscilloscope. Great vids! Keep up the good work!
The director of my church band who played session fiddle in the 70s-80s has a pre CBS 65 silver face twin that he brings just for the fiddle. Keys player and I were drooling all over it last night.
@@TheGuitologist I’ve built a crossover with entirely NPE, but I’ve found that for like if you need 80uF, using like a 65uF NPE and adding 15uF of poly gives you the performance without the huge expensive caps.
Yah if there are strange noises and all the components check out, I’ll run the meter over the board to the lugs and see what it’ll pick up. You can take a hair dryer to the board and it’ll work to remove moisture sometimes.
When I was 17 (1978), my Ampeg G412 solid state amp blew up when I decided to add a 4x12 cabinet to it by using a Y chord on the speaker output. Impedance mismatch???? Couldn't be. Anyway, our bass player had a 66 Bassman head that he let me use (through the 4x12 that blew up my amp)for several months and I just loved the thing. I always played it dimed and it sounded great. One night the owner of the bar we were playing at approached the stage screaming "turn down that squealin ass guitar"!!!!! I was heavily influenced by Billy Gibbons so pinch harmonics was my thing and the amp was pretty doggone loud. Ah memories..............LOL.
Aesthetically speaking, was never big on PRS guitars. But that red one is gorgeous. Like the old BÖC song, "...red & black, that's our color scheme". Yeah - hard to eff up with a red guitar, regardless of brand. Btw, that amp sounds killer & that's thru my phone. Can only imagine what it's like being in the same room with it & a good cab.
You are so much more actual hands on than Uncle, he’s good for a quick overview but you get into the meat and potatoes. You are the king of this genre.
Well thank you, but Uncle Doug is and always will be the King of the amp video genre. His 30,000ft overviews of the parts of amps are a must-see for anyone wanting to repair or mod this stuff.
To say Brad is the next generation after the Uncle Doug era, would be more accurate imo. Although, in your defense Tony, Brad takes on solid state flavors and more. So, I won’t discredit his abilities which are Fkn super good👍🏻
@@IndianaDoug uncle Doug is THE guru, don’t get me wrong. His series on the various components on the amp is the best there is. His technical knowledge his sense of humour his ability to talk in reality rather than theory is bar none. Since he’s covered so much ground in his videos he doesn’t like to repeat himself. You don’t see uncle Doug actually soldering anything anymore he skips all that and just presents his completed work which makes the videos very easy and fun to watch. My point is Brad still shows him mucking around in the guts finding the problems and then fixing them. Really a different genre altogether.
@@TheGuitologist yes very true. The fact that uncle doesn’t like to repeat himself he’s covered so much ground in past videos he just shows his completed soldering etc. We never have to sit there while he’s mucking around. It’s also great fun to see a guy really get into the guts of the amp to find its flaws. Really a slightly different genre you two. Very complimentary.
Not sure what Fender was thinking with the ab165.... I mean, I do get it. Stiffer and cleaner was the phrase of the day with all of the silver face amps, but simply taking out all of the local feedback loops makes such a huge difference.
wow,you can really tear shit up and i mean that in a positive light.your playing is otherworldly and could easily send some "Nashville stars" packing along with most of the hard rock guys in L.A as well.you have some otherworldly chops,i dont know if you are aware of this FACT but man,you can play.im awed and ive been at it for 35+ years.i can play but you can make jaws hit the floor
That's the meanest sounding Bassman head I've ever heard. Dang. You're a killer guitarist, man. You should call yourself the Shredding Guitologist, lol.
Brad The Solderist - Fastest heat pencil in the East ! Appreciate the sped up soldering job - we get to see all the work in a quarter of the time - excellent !
kool , I'm confident that you'll be able to get my old Musicman working again .....A ray of sunlight , on an otherwise cloudy day .....She's in overall good condition , 2 owner....only cons are...non-original speaker , purple velvet grill cloth & missing the small HD112 placard on the front....but does still have the larger Musicman placard , top corner front......As I've said , I owned 'er for over 30yrs , and it was always a great little gem amp...I'm going to miss it....truth be told , my house is just so small , that I have nowhere to keep it....especially when I get my new one.....So anyway , I'll hope to get back w/ ya after the holidays.....Hope you have a happy Holidays there...Rock onnnn , soundin' kick ass on that test out Robert
Cool high gain tone there at the end! That "Trainwreck" in the amp title would look pretty cool on an amp... some sort of nasty rock machine or something
20:10 you could go out for a bite and you'll still be hearing that one! You're a really good guitar player, Brad - even after I remember to switch off 1.5x speed :P
I liked this more streamlined type of video with overdubs. More to the point! Not that I don't like your normal commentary, i like all your troubleshooting videos!
Brad I have a 68 bass man that I lost the schematic for mod….it runs a single 34 crazy mods but is really cool..I love the 68 stock with an old rat …but my amp is also very cool…
I'm new to this so just asking. Would an oscilloscope with perhaps a signal source have allowed you to determine the bad stage and then actual component(s) without all the trial and error?
@@TheGuitologist haha yeah i can imagine that. That high gain twin reverb i had also was silly loud. Like to the point where you just wonder how so much volume is possible at all
@@TheGuitologist a friend of mine had a bandmaster modded in 1976 . It sounded great and loud. He was playing the hotel California solo in the music shop. Good job. I hope you and your family get counseling and are reunited.
Uncle Doug is far and away superior in electronics knowledge and the ability to teach it , but Brad has come a long way from his first muddling around in an amp. Brad IS a very excellent guitarist ...
@@jenniferwhitewolf3784 I couldn't agree more. But Uncle Doug's playing still sucks as bad as Brad's politics. (I know, one should never say so). They both aim for the same amplifier characteristics, and I sure appreciate that. I look forward equally to posts from both of them. I trained as a mechanical aerospace engineer in the 60's, and made guitars and amplifiers for our 5-man rock band when we couldn't buy them. We created 50W amps using EL34s and heavy duty twin-cone 12s in twin bass reflex enclosures, so Brad and Doug bring back many pleasant memories.
@@tonyduncan9852 Interesting information Mr. Tony 👍. I spent a couple of years around aircraft in the early 80's. Sweeping floors and taking out the trash from the hangar. I got to change the oil on our Piper Aerostar a few times.
I had that exact year and model played it through a ampeg cabinet with 2 15's, wish I still had it play a Precision bass through it. My first bass amp.
Thanks for the diagnostic video. My skill set with soldering iron is confined to pickups, capicitors and push pull pots. I would never trust myself to tinker with the power amp. Too many shocks from an old Ampeg amp from the early 1970's to remind me of the potential.
I have a GK 250RL head that needs going over and new caps. Thing is this amp would probably give you two nervous breakdowns. It is so tight in there that you have to disassemble it to do the job. I think it is only like 3 1/2 inches tall and like 6 inches wide. Might be a fun couple part video, but maybe not.
I really enjoy your videos. I’ve been working on old tube radios for awhile and am starting to get into amp repair. Very informative stuff, and really like the way you edit your footage.
I had the same problem with a Silvertone 1471 found a grid bias resistor R13 that fed pin 4 of the 6V6 changed value from 4.7K to 3.5K and was probably due to arcing inside the resistor, replaced it and the amp quieted down. In electronics it is always stressed that resistors only open and capacitors only short which is generally true however you must keep an open mind. BTW, I bought a Baseman amp AB165 in 1983 for $35.00 at Imperial Beach Calf swap meet; still have it, had to reform the capacitors in 2007 using a light bulb in series feeding from the hot side for safety, started with a 7W and moved up to a 60W still using the amp today never had to replace anything except for tubes, thinking about adding the unused 2nd half of driver 7025 to get a Vox type of sound. There are a million of these amps out there so I would not feel bad about doing the mod.
This is the very silly Silver face Bassman that has the 1st plate resistor bypassed with a .01 uf ceramic to guarantee no treble above 3 Khz, remove it for lots of gain and a perfectly beautiful channel #1. The CBS guys evidently felt that this amp for Bass should have no mid or treble,.. JUST bass. readily viewable upper right hand @ 6:56
Your issue was the Ceramic Disc Cap. They get micro fractures and creates that sparking/bacon sound.. I've changed many for this reason... everyone thinks they never go bad, but they do.
Sir, great tone, great Bassman tone. Really sounds very Joe Perry, Brad Whitford tone, like that, rich, thick and bright. My Bassman use includes the front channel with the 'deep' switch toggled, then ganged to the second channel for more 'adjustment.' Really like the 'deep' switch, careful with that solder gun,,,,,thanks,
Ah cool I got some JJs today for my Super 60. My amp tech friend said "go on Watford Valves and get the cheapest ones you can find that aren't from China!" I think there's enough room for them though, luckily, so they shouldn't break...
hey Brad thanks for the content again cool video I'm looking to buy a used tube amp my first one well actually I had a 1983 I had bought at a yard sale a Epiphone zephyr electar I think that's the correct word amplifier and it ended up getting stolen when I moved to California and it was shipped anyway I was looking to spend like 300 bucks for a used one or a 274 for the one that mono price advertises the 15 watt 2 amp with a cheap celestion speaker reverb I think it's got an effects loop and and a speaker out and it also has a tenuation I think it goes down to one watt so yeah I've seen a lot of demos and reviews on it and they all get really good ones but it's you know a real cheaply made that everything inside is good but it used it's not a real solid wood cabinet and any help if you know where a good place to find one use them that would be appreciated I think I'm going to search for I've heard that the Russian mega amps are pretty good and the reasonable price anyway I hope you're doing well and I hope there's no hard feelings about the comments I left I really appreciate you and look up to you get a lot of info from you and enjoy your videos so stay safe and that's about it sincerely you was, your buddy Bob the blind bedroom guitarist
I’ve finally switched to 1 watt carbon film resistors. The plate resistor noise has magically disappeared from my custom amp builds. I’ll keep using my small stash of Allen Bradley’s for vintage repairs and accurate reproductions. They do add to the sound, not saying it’s good or bad though.
Wow man that DOES sound good! This was a great learning video for tracing problems. Even if I didn’t completely understand why you made certain changes yet. Thanx!
That 470K resistor from plate to grid on that 7025 tube is unusual because its feeding back the output signal back to the input signal? not sure why they did that because most fender amps don't have that
Nice job! Now your customer has a much more dependable amp. That old shit needed to go anyway. Nothing worse than an amp failure on a gig or in the studio. You did the right thing Brad! This old cardboard Bakelite stuff can be a real pain to get right. When they're old like that it best to be through. Empathy for a customer is a good thing. Sounds happy now! :)
Even via UA-cam compression that amp sounds like a million damn dollars! (But I WAS streaming through TV and surround sound system☺) Nice video thanks for sharing.
Interesting mod, guess the first stage tubes seeing less impedance on their output, combined with more of their gain going to ground due to the way smaller grid leak, mean that the earlier stage will go into overdrive sooner, and the following stage won’t become overdriven by it as easily?
Those frying steak noises were very unpleasant. And I don't understand that 470k resistor feedback thing etc. at all. Never seen before. Thanks for those seriously hot guitar licks! 👍
Hey Brad, I was noticing toward the end of your playing, you showed a close up shot of the back of the amp and showed a two prong plug-in. Is that a live plug for AC without a ground? If it is, what is it for? Great video Brad.
That's a nice mod on that Bassman. Do you have a price list somewhere?
It's in my head. And it goes something like this:
Fender: standard charge
Gibson: standard charge
Ampeg: standard charge
Marshall: slight upcharge if it's a DSL or TSL
Mesa Boogie: i'll disassemble it for FREE!
@@TheGuitologist What about Vox?
@@TheGuitologist I have a Double Rectifier I need upgraded.
@@TheGuitologist so no more mesas hehehe after that nightmare I'm totally agree with you
@@drdrums1 well it's basically standard charge for simple amps, ones that don't have like complicated PCB layouts and stuff, most vox's would fall into that category. I think...
As someone who was friends with Ken Fischer since 1988, I can say with certainly that Ken would have been very impressed with you, Brad. He was one of a kind. Sure miss him.
You made me smile. Thanks for that.
@@TheGuitologist Sure thing, Brad. Hope all is well.
Ken Fischer Jesus Christ. Well just about the same. 🤘
Brad! Are these heads 4ohm? Those are the old fender m-80 cabinets which I love! Not sure which input you had it in but 8ohm won't hurt will it?
That's awesome!! I thought that and I don't know both personally 😂
I subscribed to this channel because of you calling out rick beato (which was fun). But watching that I didn't expect these kind of videos. Very cool!
My son recorded his bands first 2 albums with a 66 Black face Bassman that my daddy had bought for he and I in 74. He then let Chris use it for recording .Tragically it wasstole stolen from the storage unit they shared with The Kentucky Headhunters. Learned to play a lot of ZZ Top through that amp.
Check em out. Black Stone Cherry
I remember I built a Blackface Deluxe Reverb and when I finished I had some noise and squeal when the amp was turned up. I tried lots of things...in particular I cleaned up my grounds and some of my wire routing and length and couldn't find it. I changed out a few items that I though would cure it, but had many hours of trouble shooting and couldn't figure it out. I ended up buying an Oscilloscope. I checked the signal at the output and could see the wave form get these weird spikes, (that I guessed was parasitic oscillation). I ended up looking at the wave stage to stage. 1st stage was fine - second stage was fine, etc. I forget the exact spot but it was somewhere after the second stage and it was right near around the trem circuit. Turns out I had scrounged up one resistor from my box of parts that came from an unknown source, but was my only one of that value I think it was the 4.7M resistor coming off the reverb feeding the grid of the next stage. Yanked that resistor and put in a new one and bingo! That was my first experience with a signal generator and an oscilloscope. Great vids! Keep up the good work!
The director of my church band who played session fiddle in the 70s-80s has a pre CBS 65 silver face twin that he brings just for the fiddle. Keys player and I were drooling all over it last night.
If it’s a Silverface, it’ll be 68 or later. There aren’t too many differences between the blackface and silverface ones really. They all sound good.
@@TheGuitologist thanks, I’ll let him know that his dates are wrong lol
@@TheGuitologist brad what do you think about changing caps in a speakers crossover from electrolytic to poly?
@@graxjpg You probably won't find the values you need for a crossover in all poly caps.
@@TheGuitologist I’ve built a crossover with entirely NPE, but I’ve found that for like if you need 80uF, using like a 65uF NPE and adding 15uF of poly gives you the performance without the huge expensive caps.
PRS Brad the guitologist signature series. To be release in 2021. Dont delay, request today 👍
The bacon 🥓 was making me hungry in the beginning of the video but I found myself reaching for my drum sticks in the finale.
Hey, Brad! You played some nice licks, good stuff! The feedback sounds awesome!
I love how you use a marshall head as a stool man!! Great video as always!
@West Coast Cartoon what has that got to do with a great amp video buddy? Aggression can be passive as well as active and never looks good on anyone.
My two most used tools: chopstick and hemostats. Sometimes the board will become conductive after being exposed to moisture.
Luthier Vandros Yep! I’ve run into that too. Enough moisture and the fiber board will begin to conduct.
Yah if there are strange noises and all the components check out, I’ll run the meter over the board to the lugs and see what it’ll pick up. You can take a hair dryer to the board and it’ll work to remove moisture sometimes.
@@luthiervandros - alcohol will dry it and clean up any gunk too 👍
I used a Walnut dowel sharpened at one end. It's longer for those hard-to-reach Mesa boogie amps.🤘
When I was 17 (1978), my Ampeg G412 solid state amp blew up when I decided to add a 4x12 cabinet to it by using a Y chord on the speaker output. Impedance mismatch???? Couldn't be. Anyway, our bass player had a 66 Bassman head that he let me use (through the 4x12 that blew up my amp)for several months and I just loved the thing. I always played it dimed and it sounded great. One night the owner of the bar we were playing at approached the stage screaming "turn down that squealin ass guitar"!!!!! I was heavily influenced by Billy Gibbons so pinch harmonics was my thing and the amp was pretty doggone loud. Ah memories..............LOL.
Aesthetically speaking, was never big on PRS guitars. But that red one is gorgeous. Like the old BÖC song, "...red & black, that's our color scheme". Yeah - hard to eff up with a red guitar, regardless of brand.
Btw, that amp sounds killer & that's thru my phone. Can only imagine what it's like being in the same room with it & a good cab.
You are so much more actual hands on than Uncle, he’s good for a quick overview but you get into the meat and potatoes. You are the king of this genre.
Well thank you, but Uncle Doug is and always will be the King of the amp video genre. His 30,000ft overviews of the parts of amps are a must-see for anyone wanting to repair or mod this stuff.
To say Brad is the next generation after the Uncle Doug era, would be more accurate imo. Although, in your defense Tony, Brad takes on solid state flavors and more. So, I won’t discredit his abilities which are Fkn super good👍🏻
@@IndianaDoug uncle Doug is THE guru, don’t get me wrong. His series on the various components on the amp is the best there is. His technical knowledge his sense of humour his ability to talk in reality rather than theory is bar none. Since he’s covered so much ground in his videos he doesn’t like to repeat himself. You don’t see uncle Doug actually soldering anything anymore he skips all that and just presents his completed work which makes the videos very easy and fun to watch. My point is Brad still shows him mucking around in the guts finding the problems and then fixing them. Really a different genre altogether.
@@TheGuitologist yes very true. The fact that uncle doesn’t like to repeat himself he’s covered so much ground in past videos he just shows his completed soldering etc. We never have to sit there while he’s mucking around. It’s also great fun to see a guy really get into the guts of the amp to find its flaws. Really a slightly different genre you two. Very complimentary.
Not sure what Fender was thinking with the ab165.... I mean, I do get it. Stiffer and cleaner was the phrase of the day with all of the silver face amps, but simply taking out all of the local feedback loops makes such a huge difference.
I’m steady checking my local GC dumpster! Nothing yet . But you never know
wow,you can really tear shit up and i mean that in a positive light.your playing is otherworldly and could easily send some "Nashville stars" packing along with most of the hard rock guys in L.A as well.you have some otherworldly chops,i dont know if you are aware of this FACT but man,you can play.im awed and ive been at it for 35+ years.i can play but you can make jaws hit the floor
Oh hellz yeah! Brad and a Trainwreck. Been waiting for this one.
I have a 1967 Bassman that has the original glass with it and it's an amazing sounding amp. It's a life time piece for sure.
All killer no filler! Great job dude! I had an old Bassman back on the day. That one sounds awesome! Metal!!!!
I contemplating buying one... Played one about three weeks ago, just incredible tone, sustain and feedback for days... Really dig it
That's the meanest sounding Bassman head I've ever heard. Dang. You're a killer guitarist, man. You should call yourself the Shredding Guitologist, lol.
Shredologist.
Great idea but, All the Shredding's are trademarked or being used by a UA-camr or email name. That's why I spell my name with 1D.
Had one of these heads back in late 90s, shoulda had it done like this.....sounds awesome.
When all else fails read the schematics.
Then we wouldn't have a trainwreck to watch...once again. "We're Gonna Need Another Timmy" 😂
Haha, sitting on Marshall. Marshall really do everything :)
It's for the vibe.
Oh man that amp ROCKS! You totally busted the ass in that annoying noise problem didn'tcha!
One GREAT amp Brad well done!
Congratulations on restoring the ship of Theseus.
WOW! A well deserved jam after a tricky shakedown of one sizzling resistor. Seems that amp got even better in the end.🤘🤘🤘🤘🤘
G'day, Brad! Great job on this Fender Bassman Amp! "It's as loud as any Marshall!!" Enjoyed the Video! Thank you!
Cheers! 😊✌🏼🎸❤️
Wow! it's nice to see a video with no massive mental breakdown or conspiracy theory.
Its not conspiracy theory.. Mostly its facts...
Brad The Solderist - Fastest heat pencil in the East ! Appreciate the sped up soldering job - we get to see all the work in a quarter of the time - excellent !
kool , I'm confident that you'll be able to get my old Musicman working again .....A ray of sunlight , on an otherwise cloudy day .....She's in overall good condition , 2 owner....only cons are...non-original speaker , purple velvet grill cloth & missing the small HD112 placard on the front....but does still have the larger Musicman placard , top corner front......As I've said , I owned 'er for over 30yrs , and it was always a great little gem amp...I'm going to miss it....truth be told , my house is just so small , that I have nowhere to keep it....especially when I get my new one.....So anyway , I'll hope to get back w/ ya after the holidays.....Hope you have a happy Holidays there...Rock onnnn , soundin' kick ass on that test out
Robert
How do all of those changes affect the tone? Also... did I understand you correctly, you are swapping out resistors to capacitors?
I'm surprised that I didn't catch this when you first put it out, Brad; glad it showed up in my feed on the rebound. Another awesome job...
I'm that amp's owner! Thanks so much for the work, Brad! Can't wait to have it back home.
@mstecker gidday you lucky guy! Hey how does the amp sound for you now that you've got it back? Brad had it sounding just amazing!
WOW! BEAUTIFUL TONES AND GUITAR PLAYING! YESSSSSSSS!!!!!!
sounds really nice! Many times have good players dispelled the myth that silver panel Fenders suck. Well done.
Love the intro. Great BBC comedy memories.
Keep em coming Brad!
It was Thames, an ITV franchise
Cool high gain tone there at the end! That "Trainwreck" in the amp title would look pretty cool on an amp... some sort of nasty rock machine or something
@@VincentVader I did immediately after making the comment and was quite surprised, cool amps
lol.. Fender Trainwreck would be more like it... sounds unbelievably awesome...
20:10 you could go out for a bite and you'll still be hearing that one! You're a really good guitar player, Brad - even after I remember to switch off 1.5x speed :P
I liked this more streamlined type of video with overdubs. More to the point! Not that I don't like your normal commentary, i like all your troubleshooting videos!
Brad, you're fuk'n wicked smart when it comes to amplifiers, dude !!!
Brad I have a 68 bass man that I lost the schematic for mod….it runs a single 34 crazy mods but is really cool..I love the 68 stock with an old rat …but my amp is also very cool…
I love watching you work your magic. Amazing stuff! I've learned a lot of trouble shooting tactics thanks to you man. Amazing playing!
I really LOVE the opening titles, a-la 'Thames Television', and yeah, I do live on the Thames! Great video as usual!
I'm new to this so just asking. Would an oscilloscope with perhaps a signal source have allowed you to determine the bad stage and then actual component(s) without all the trial and error?
wow pretty metal sounding in the end,. somehow reminds me of a twin reverb with high gain mod. is it defening loud?
It is VERY LOUD. It's as loud as any Marshall I've ever owned on 3 on the Master.
@@TheGuitologist haha yeah i can imagine that. That high gain twin reverb i had also was silly loud. Like to the point where you just wonder how so much volume is possible at all
That sure isn't your father's Bassman, good job Brad.
@@TheGuitologist a friend of mine had a bandmaster modded in 1976 . It sounded great and loud. He was playing the hotel California solo in the music shop. Good job. I hope you and your family get counseling and are reunited.
@@leonthompson8988 same here on the counseling part.
Woah! Sounds monster! You have some pretty good shred chops too, man.
I enjoy these very informative videos and I always learn useful things.
Brad and Uncle Doug are great resources AND are very entertaining 👍🍻
Except Uncle's playing sux bigtime. Pets and hotrods compensate for this. a bit.
Uncle Doug is far and away superior in electronics knowledge and the ability to teach it , but Brad has come a long way from his first muddling around in an amp. Brad IS a very excellent guitarist ...
@@jenniferwhitewolf3784 I couldn't agree more. But Uncle Doug's playing still sucks as bad as Brad's politics. (I know, one should never say so). They both aim for the same amplifier characteristics, and I sure appreciate that. I look forward equally to posts from both of them.
I trained as a mechanical aerospace engineer in the 60's, and made guitars and amplifiers for our 5-man rock band when we couldn't buy them. We created 50W amps using EL34s and heavy duty twin-cone 12s in twin bass reflex enclosures, so Brad and Doug bring back many pleasant memories.
@@jenniferwhitewolf3784 Yes, Brad can play well.
@@tonyduncan9852 Interesting information Mr. Tony 👍. I spent a couple of years around aircraft in the early 80's. Sweeping floors and taking out the trash from the hangar.
I got to change the oil on our Piper Aerostar a few times.
Holydamn, Brad you kick ass on that guitar! And on repairing amps! And on speaking truth. I love this channel
Jesus Christ that amp sounds amazing...
Great job on rescuing the video with the voice over instead after the audio failed, too
I had that exact year and model played it through a ampeg cabinet with 2 15's, wish I still had it play a Precision bass through it. My first bass amp.
11:48 I love how you're working on this thing at 3:24am. I tend to do this too from time to time. The house is nice and quiet.
Thanks for the diagnostic video. My skill set with soldering iron is confined to pickups, capicitors and push pull pots. I would never trust myself to tinker with the power amp. Too many shocks from an old Ampeg amp from the early 1970's to remind me of the potential.
That kicks rhinobutt. What an amp! Fantastic tube tone.
Glad to see and HEAR you are back Brad!!! A most amazing repair you have done😊
Good Knight !! That thing is a Tone Mach.
Some smoking hot playing there at the end man! Woooooooo! 😊🤟🏽 I enjoyed that. Thanks for another awesome video Brad. Have an amazing day!
Brad the Shredologist GO ON AND GET YOU SOME BOY!!
I did!
I have a GK 250RL head that needs going over and new caps. Thing is this amp would probably give you two nervous breakdowns. It is so tight in there that you have to disassemble it to do the job. I think it is only like 3 1/2 inches tall and like 6 inches wide. Might be a fun couple part video, but maybe not.
I really enjoy your videos. I’ve been working on old tube radios for awhile and am starting to get into amp repair. Very informative stuff, and really like the way you edit your footage.
More power in a vacuum tube amplifier is great that's for sure. I feel sorry for anyone using a weeny amp.
I had the same problem with a Silvertone 1471 found a grid bias resistor R13 that fed pin 4 of the 6V6 changed value from 4.7K to 3.5K and was probably due to arcing inside the resistor, replaced it and the amp quieted down. In electronics it is always stressed that resistors only open and capacitors only short which is generally true however you must keep an open mind.
BTW, I bought a Baseman amp AB165 in 1983 for $35.00 at Imperial Beach Calf swap meet; still have it, had to reform the capacitors in 2007 using a light bulb in series feeding from the hot side for safety, started with a 7W and moved up to a 60W still using the amp today never had to replace anything except for tubes, thinking about adding the unused 2nd half of driver 7025 to get a Vox type of sound. There are a million of these amps out there so I would not feel bad about doing the mod.
This is the very silly Silver face Bassman that has the 1st plate resistor bypassed with a .01 uf ceramic to guarantee no treble above 3 Khz, remove it for lots of gain and a perfectly beautiful channel #1. The CBS guys evidently felt that this amp for Bass should have no mid or treble,.. JUST bass. readily viewable upper right hand @ 6:56
Your issue was the Ceramic Disc Cap. They get micro fractures and creates that sparking/bacon sound.. I've changed many for this reason... everyone thinks they never go bad, but they do.
Sir, great tone, great Bassman tone. Really sounds very Joe Perry, Brad Whitford tone, like that, rich, thick and bright. My Bassman use includes the front channel with the 'deep' switch toggled, then ganged to the second channel for more 'adjustment.' Really like the 'deep' switch, careful with that solder gun,,,,,thanks,
Ah cool I got some JJs today for my Super 60. My amp tech friend said "go on Watford Valves and get the cheapest ones you can find that aren't from China!" I think there's enough room for them though, luckily, so they shouldn't break...
hey Brad thanks for the content again cool video I'm looking to buy a used tube amp my first one well actually I had a 1983 I had bought at a yard sale a Epiphone zephyr electar I think that's the correct word amplifier and it ended up getting stolen when I moved to California and it was shipped anyway I was looking to spend like 300 bucks for a used one or a 274 for the one that mono price advertises the 15 watt 2 amp with a cheap celestion speaker reverb I think it's got an effects loop and and a speaker out and it also has a tenuation I think it goes down to one watt so yeah I've seen a lot of demos and reviews on it and they all get really good ones but it's you know a real cheaply made that everything inside is good but it used it's not a real solid wood cabinet and any help if you know where a good place to find one use them that would be appreciated I think I'm going to search for I've heard that the Russian mega amps are pretty good and the reasonable price anyway I hope you're doing well and I hope there's no hard feelings about the comments I left I really appreciate you and look up to you get a lot of info from you and enjoy your videos so stay safe and that's about it sincerely you was, your buddy Bob the blind bedroom guitarist
Hey Brad-I have a NOS Stancor A-3801 OT new in the box for an Express. Lemme know if you ever get one on the bench that needs to be replaced.
Holy crap that thing is a BEAST!!
WOW! What a monster when all's said and done. Nice work, Brad!
Brad buddy you were about too catch that guitar neck on fire lol always enjoy watching the show God bless!
how about an oscilloscope?
Are you still in your new house? I was just now getting used to your basement workshop in the old place.
Thats a little piece of heaven!
Suggest adding a ribbon mic to the speaker edge for the bottom end thump :o)
Replace the blues only when needed. Rightly or wrongly, folks think those give old Fenders "that tone". Sounds like it needs more lows cut out.
Fender BassMAN THE TONE we have all been chasin !!
I’ve finally switched to 1 watt carbon film resistors. The plate resistor noise has magically disappeared from my custom amp builds.
I’ll keep using my small stash of Allen Bradley’s for vintage repairs and accurate reproductions. They do add to the sound, not saying it’s good or bad though.
Wow man that DOES sound good! This was a great learning video for tracing problems. Even if I didn’t completely understand why you made certain changes yet. Thanx!
That 470K resistor from plate to grid on that 7025 tube is unusual because its feeding back the output signal back to the input signal? not sure why they did that because most fender amps don't have that
Killer tones....did you do anything with the bass side? Have a stock 65 the temptation is strong to send it to you....lol
Watching you repair a SF Bassman while I jam on my 68 SF Bassman.
Why do you replace components to try to find the problem? Wouldn’t taking measurements with a meter be faster and more accurate?
Darn….again wish you were local I got the same silver face, stock fenders are just too tame, even my restored Blackface, awesome!
Nice job! Now your customer has a much more dependable amp. That old shit needed to go anyway. Nothing worse than an amp failure on a gig or in the studio. You did the right thing Brad! This old cardboard Bakelite stuff can be a real pain to get right. When they're old like that it best to be through. Empathy for a customer is a good thing. Sounds happy now! :)
Even via UA-cam compression that amp sounds like a million damn dollars! (But I WAS streaming through TV and surround sound system☺) Nice video thanks for sharing.
That’s a great sounding amp dude! Some nice chops there!
Great vid and great job on the amp, it sounded amazing at the end, also due to your fine playing my friend : )
Brad shreds. looks good sounds great! i see you got in the zone...Nice jam!
Awesome looking Amp 🤟🤠🤟🔊🔊🔊🔊Great work Brad 🤟🎸🎸🎵
Had a 68 Bassman a few years back and it was pretty awesome.
Interesting mod, guess the first stage tubes seeing less impedance on their output, combined with more of their gain going to ground due to the way smaller grid leak, mean that the earlier stage will go into overdrive sooner, and the following stage won’t become overdriven by it as easily?
beautiful harmonic feedback is what love about these amps ! Nice work!!
Kudos for fantastic effort. As usual.
Jeez Brad that's pretty wicked sounding... it's not a Fender anymore though it's some kind of bumper or bush bar now I think lol great video
I had a amp like that years ago with the tall 2x12 cabinet. And then I lent it to someone. Still not sure what state he fled to.
This is why I came to this channel awesome!
Those frying steak noises were very unpleasant. And I don't understand that 470k resistor feedback thing etc. at all. Never seen before.
Thanks for those seriously hot guitar licks! 👍
Hey Brad, I was noticing toward the end of your playing, you showed a close up shot of the back of the amp and showed a two prong plug-in. Is that a live plug for AC without a ground? If it is, what is it for? Great video Brad.
Dude this might be the best tone in the world! I love tge trainwreck Liverpool and this might be better! Pete thorn has a fantastic trainwreck demo !