Build 300B SE tube (valve) amplifier with toroidal transformers
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- Опубліковано 11 лис 2019
- I read somewhere that a bad amplifier can't be made with a 300B tube (valve).
This is my attempt with the standard scheme but with toroidal transformers (Toroidy) and with a slight modification of the scheme. I added the PS anti-noise part (see Aikido SE output stage).
Schemes and photos:
drive.google.com/drive/folder... - Наука та технологія
I've seen many diy stuff for years but this is a piece of art. You my friend have a sense of design that is in every detail tobe not only efficient but beautiful. Hats off. I wish I could do the same (having access to more equipment helps...)
Love the inside of the chassis - how the components are neatly laid out in contrast to vintage electronics where they look like a bird's nest of wires. Beautiful.
Those valves are works of art, beautifully complimented by your exquisite workmanship. Congratulations.
That was really cool to watch. I dont know anything about electronics other than how to plug them together. this is so awesome!
It really is mesmerizing with how beautiful and precise the work is.
Glad to see somebody building their own equipment especially valve. I still have my late father's amp's and pre-amp he originally built in the late 50's and then rebuilt for me in the mid 90's his own design. They still work perfectly today!
Sve čestitke za vrlo dobrom obavljenom poslu. Ovo je za primer. Elegantno, precizno i kvalitetno.
Mágico trabajo, ejecutado con amor, ha sido como ver a un lutier, fabricar su guitarra o su laúd! Gracias!
Thank you so much for this. I've downloaded your complete plans set and this looks pretty straightforward. It'll be a while before I complete the project, but I will add to the community by creating a new video of the final project and attribute the design to you. Again, superb work and thank you for sharing.
Really great and accurate design and manufacture. Every second of the video is full of hints.
Thank you, Rob, for your attention to detail and execution of the highest order.
absolute genius ... definitely the best looking tube amp on youtube ... must build this before i die ... thank you for sharing on google drive so i can start doing my homework
Love the Soundtrack of your video. "Smoke filled rooms" is a great album.
Your amp build is awesome - feel motivated now.
A work of art - and science. Thank you for sharing (and making) this.
Bravo na izuzetnom radu. Sve je pedantno uradjeno i prosto se ne može naći primedba. Kao da ga je radila neka brendirana firma. Još jednom BRAVO i pozdrav iz Beograda.
Beautiful job. A masterpiece.
Wow! Rare to see DIY audio done with such skill and attention to detail! I bet it sounds as good as it looks :)
Sounds great to me, i listen Silvaweld 300B monoblocks at home. Beautiful craftsmanship 👍👍👍
Absolutely beautiful build Robert. I love the CNC work on the cabinet and of course the layout of the electronic components. I built a kit into a Pink Floyd lunchbox and it came out great! It was not nearly as complex as your build, and it uses a pcb board but works and sounds great with my old JBL speakers. I rebuilt an old iPod which contains my entire music collection and the setup sounds great to my ears. I'm sure some hifi purists would critique my system to death but it sounds wonderful to me and that is all that matters lol. Like you, electronics are a hobby I use to amuse myself. I don't need to keep customers (or critics) happy lol. I got the kit from Tube Depot in the U.S. If anyone is interested. I believe I paid around $400 for all of the components.
Very nice build! I have built one with the same schematic and will add the anti-noise part C2+C3 connection to reduce noise. Thank you very much for the hint, didn't know about it and can't see it mentioned in Popovich book either. Thanks again!
Congrats! Great project, great craftsmanship and nice background music 👍
I like the attention to detail, really good build!
not sure how i got here, but thank you. oddly satisfying to watch.
Gorgeous build on this amp BRAVO!!!
This is a good video. It is a well-made product.
Congratulations!!
Beautiful work. Great to see your adjustments too
Absolutely remarkable DIY in 2022 I was a little confused to follow your steps..but Thank your for presentation good Video…
Best regards
bravo majstore, izgleda fantastično a kladim se da isto tako fantastično i zvuči
Work of art!! If I were to make one change it would be to use a stepped attenuator instead of the volume pot you have.
Beautiful job Robert. Well done.
Wonderful craftsmanship.
Top notch craftsmanship 👍🏼
A Lovely Job. Good soldering skill is important, as you have found out ;-) . I'd be tempted on the Mk II version to fit the input switch at the back panel, with an insulating shaft to the front control. This is a project that is as good on the eye as it hopefully is on the ear.
ESPETACULAR !seu trabalho é perfeito parabéns,arrumei vários amplificadores a válvula no começo de carreira, som ótimo !
great job. and beautiful looking Amp.. Kudos 👍.
Wow, looks beautiful! 👍
Gorgeous! Very nice build!
Excellent build, very neat indeed
Thanks for sharing a lovely build. Regards Chris
loved watching a perfect job ! would love to listen to it !
Very, very nice! Wish I could hear it.
This is absolutely beautiful. I've been wanting to build an amplifier and stumbled across yours. Love the look and the attention to detail in the build. I would like to try to recreate this but with a different finish on the wood, black powder coating on the aluminum sheet, and black knobs. Could you help me with the specs on the power transformer? If I was to have this made, would I only need to specify my line voltage and the secondary voltages, or is there more to it than that? Would you mind sharing whatever specs I would need to have one built for myself with a 120V primary? Any help is very much appreciated.
Beautiful work.
Very good job! Perfect wiring!
nice wiring job , good realisation ! bravo .
Wow ! Amazing work sir !
Awesome project! Great work on the video.
Jesus, do you comment on every single video related to audio? Lol.
@@omgwtfpwnd Do you troll all of my comments. I only leave constructive ones. You must really be bored.
Very neat and tidy with much thought put in to the actual physical layout. You must have had your nephew do the dicky solder joint because all the others I saw were damn near perfect!
Really awesome work! Wish i could do that!
Damn - I hate you for building something that inspires me to build something. There are already too many beautiful things I want to build. Grrr.
A piece of art! 🥰
A masterpiece. I just wish this video was ten hours long so I could copy your work. 😁
I'm building one. It looks great!!!
hi i have question we can use this amp for turntable mm cartridge??
Good job! Sounds great!
woshine
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소리가 너무 선명하고 부드럽습니다, 똑같은것으로 하나 가지고 싶습니다
May you list nominal voltages and currents for each secondary winding in power toroid, diameter of wire (or something except 10H 250mA) for choke toroid, and most important - parameters for output toroids please? Exactly what you ordered from factory. I need to order toroids, but I don't know parameters. You may list them on google drive too.
Good Job. Congratulations!!!
Fuck man this is a beauty! Going to try to see if I can do it, thanks for the inspiration
What an absolute beauty!
Beautiful build
Beautiful build.
this video makes me happy, thanks
Would you happen to have a parts list for this build?
That's some smooth jazz music!
Great project Robert. And thanks for sharing your design. I have decided to use your video as a guide to build this tube amp. Was there a specific reason choosing KPCU-01 over MPK-14 for 0.22 uf? Given the price difference?
In this case I prefer the sound of copper-polypropylene-paper or PIO
Class A? How much power does it dissipate? I assume the power is the same at idle and full output. And no feedback?
Is class A. You can calculate the plate dissipation power from the scheme I attached. The current flowing through the tube is 75V / 880Ohm = 0.085A. The anode (on plate) voltage is 445V-75V = 370V, and thus the plate dissipation power is about 370Vx0.085A = 31.5W -5.5% for screen current = 29.8W (max is 40W) which means that the tube is not overloaded. No feedback.
Very nice job, bravo!
Lijepo izgleda, Nadam se I da isto tako zvuci. Haj-Faj uzivaj.....
Let me guess: C2 and C3 were added, to couple the 120Hz ripple to the cathode follower, to cancel noise from the B+ main supply. Am I right? The small 600 V 27uF capacitor creates a voltage divider with the 103.9uF(C1+C2)total capacitance in the cathode follower circuit, which produces a ripple approximately equal to the open loop gain of just the filamentary triode.(HE-300B) That would help maintain a constant bias current, thus, eliminate noise in the output transformer. The 100Ω potentiometer is used to balance the cathode, to eliminate 60Hz hum, from the filament heater supply.
That's right, I use the last stage with cathode biasing to remove noise from the power supply on the output transformer. This only works in the last stage while in the preamp I use better filtration (RC filter: 27k + 47uF). www.tubecad.com/april99/page2.html
The potentiometer also removes 100Hz (120Hz) noise because I supply the filament heater with DC (CRC filtration with min 20 mF capacitor is required from the experiment).
Is it possible to use 2 of the 300B tubes in series or parallel to get twice the power out? If it is possible, do you know where there is a schematic?
It can be put in parallel, you can look for the circuit as PSE 300B (there are a lot of them).
Note that it is better to invest in more sensitive speakers than in power.
Love it & thanks so much for sharing
I had a SET 300B amplifier and I feel in my opinion that it has better sound quality than any other tube amp. But it only put out maybe 8 watts. So I sold it because it lacked enough power to fill the room like my 20 watt 6L6GC push pull. I want to build a 300B SET amplifier but with more power so I will use 2 of the 300B’s in Parallel as you mentioned to me. I am not familiar with the PSE 300B, so I will explore the internet and look for that schematic. You mentioned better speakers. Do you have recommendations for good speakers?
PSE = Parallel SE
I wouldn’t recommend a specific scheme to you because I haven’t tested it myself, but you can find it along with the scheme and comments from others who have tested it.
I note that with two 300Bs again you won’t get 20W maybe 14-15W.
I didn’t say better speakers than more sensitive ones. It means higher utilization of invested power.
u got it.
try these.
www.paradigm.com/en/floorstanding/signature-s8
I bought many speakers before I've met these.
these r my babies. I run'em on 5.1 surround.
I'm able to shake my Whole neighborhood.
@ Vital Ral. Thank you for that information!
Thanks for sharing this amazing work. would you please share te specs of the mains toroid?
please see the link in the text, the second item in Boom.docx
When you corrected the heating voltage and the 100Hz buzz, did you replace the 0.39 ohm 3W resister with the 0.82 ohm 5W resistor to change the value in the existing circuit? Also, did you replace the 22mF and 15mF capacitors in the original circuit with the 10000uF and 22000uF capacitors. Or did you simply add the 0.39 ohm resistor, 10000uF capacitor, and the 22000uF capacitor to the existing heater circuit as an additional CRC filter?
I left 0.39R (as the mains voltage varies a lot better that the voltage is higher but within the limits of +10%).
First I tried 10mF but I finally put 22mF and 15mF (can be higher if permitted by the physical dimensions of the case).
@@RobertZovko , I see, the voltage was high, but since it was still within +10% you were able to leave the 0.39R. If it was outside the 10%, then the 0.39 could have been replaced with the 0.82. Thank you for the help!
On a 300B PSE, 14-15 Watts is plenty! As far as sensitive speakers, do have any recommendations that are budget priced?
As for the specific speaker recommendation, I would leave it to someone else, it is important that the speakers have a sensitivity of over 90 db (/ W / m).
The higher the sensitivity, the less power the system needs for a given acoustical output. For example if your system uses 90dB speakers and 20 Watts per channel and fills a room to satisfying levels, then with 93dB speakers one would need only 10 Watts, etc.
Ok. Tnx!
Mark
Hi! Amazing work! Have you thought about making couple of more amplifiers of the same type for sale? I definitely would buy one from you :)
Can you replace the steel plate sasie with a bronze? Does it effects the acoustics?
Yes. No.
Multumim dl Zovko! 👍👍👍🌹🌹🌹 好好好
Question, can someone explain to me what is the pot near the filament of the 300B for?
the potentiometer is used to remove the power supply noise - Filament Hum Cancellation
Hi - do you ever make pieces on commission? I would be interested in discussing if so - thank you, Jonathan
No, making amps is my hobby, but thanks for asking.
love the toroidal transformers ... the old plate metal transformers look so darn klunky...
This is absolutely top notch craftmanship. Exquisite and professional work in every detail.
Deepest respect from me.
All the best, from Magnus, Sweden P.S. Where in Makarska is it ? Only been to Baska Voda yet....!. D.S.
Makarska is 10 km south of Baska Voda .
@@RobertZovko Hi Robert, and thanks for quick answer!
Almost as soon as I had posted my comment, I remembered that Baska Voda was situated in an area called "The Makarska Riviera" around the capital city Makarska. I was there with my family in 2007, when the children were small.
All the best, Magnus
Hi again, Robert! Have you been happy with the sound from your marvellously well built amp? What kind of speakers have you used? What is your estimated output ? ( I assume it is a single ended triode type amp, running in class A )
One more thing... why not having a feedback? Would that improve (if needed) the performance and frequency sensitivity?
The feedback changes the sound ... In my opinion, this amp is not needed but it can be put as you wish.
Wow 😮 hermoso amplificador ...! 👋
Hi Robert, very nice build. Love the toroidal transformers!
I built a very similar one a while ago, but I cheated and used a PCB to mount all the components (from Douk Audio) and "normal" Hammond transformers - 378X and two 1630SEA
I also used a different heater regulator that Rod Coleman designed which was a great improvement over the LM1084 regulator the original design was using.
I especially like the vented chassis plates you used to mount the tube bases - where did you get those from?
like this www.ebay.com/itm/Lot4-vintage-vacuum-tube-shock-proof-plates-fr-8Pin-octal-tube-socket-KT88KT6-JF-/254558646587?hash=item3b44e0b13b
or see aliexpress
Also do after market DC blocker help with faint buzz heard at the tweeter?
First, you need to determine the frequency of the buzzing, whether it is due to insufficient filtering (100Hz(120Hz)), or you have a ground loop (50Hz(60Hz)), or some parasitic oscillation is occurring...
@@RobertZovko I think it's more a ground loop! As the sound is better after I did some rearranging of power cords before the buzz could be heard 7 ft away and now only with my ear right next to tweeter. In this case would a DC blocker help?
Old technology will always be interesting
Hello Robert. Did you notice any difference between standard EH 6sn7 vs gold pin ones? Thanks.
I personally don’t hear any difference.
Hello Robert, very tidy layout, I wish you had some narration instead of music. Excellent video, well done.👏👏👏👏👏
Could you put it works, playing anything?
I couldn't make something like this as the schematics look like scribbles but I am really confused about one thing in particular, what did you do to that sheet of stainless??? It still had the protective sheet & would have been a nice mill finish or brushed. By the time you finished with it, it looked like it had been attacked by a mad housewife & a scouring pad!!!
great job !
What wire you use for the input to potentiometer?
what wire you use for the tube heater?
THANK YOU
Signal wire LiYDY 1 x 0,5 mm², shielded
Stranded solid copper wire with modern insulation
and lacquered cotton braid finish, Cross-Section: AWG #18 / 0,82 mm²
THANK YOU
@@RobertZovko any online shopping website suggestion? I can't find it in AMAZON
@@manchan7914 something like this:
www.amazon.com/s?k=Solid+copper+wire+with+modern+insulation+and+lacquered+cotton+braid+finish&ref=nb_sb_noss
it just has to be 18 AWG
www.amazon.com/6-foot-Shielded-Guitar-Circuit-Conductor/dp/B00E4SN4VQ/ref=sr_1_28?keywords=Single+Core+Tinned+Shielded&qid=1581324202&sr=8-28
Terrific build! How's the bass response Robert? I'm running a pair of 2nd generation Klipsch Cornwall. I've procrastinated an amp build for awhile, however I have built a preamp which sounds wonderful.
I don't have overly high quality speakers (Mission around 92dB), but the bass on them sounds decent.
Just one point of note as a loudspeaker engineer and manufacturer…SE amps, especially low powered SET amps have not got enough damping factor for any conventional 8 ohm or less speaker. Too high an output impedance. For bass control you should look to a Class AB PP design employing a lot of GNF for low output impedance. SET amps are fine for higher impedance speakers such as compression driver horn speakers but not suited to conventional speakers. People confuse power and bandwidth for control but all that matters is an amplifiers output impedance (NOT the speaker taps at 4 or 8 ohms but the actual impedance of the output transformer’s windings which typically for such an SE amp might be 2 to 3 ohms…very low damping factor as a result). I apoteciate though that this is an OTL so output impedance will be less= better control.
Very well designed! love the layout in the inside. It is a pity that we cannot hear how the amp sounds.
I would love to hear your opinions on audio, but it really doesn't make sense to put "interpretation" of audio from an amplifier on a youtube channel. They will listen to your amplifier and your speakers, not mine.
@@RobertZovko Very true, I understand it is because of the limitations of UA-cam but seeing the amplifier it made me very curious to hear how it sounds :)
Quality craftsmanship, I really liked the laser etching. How many hours did it take you?
Drying, half an hour and laser operation for a few minutes.
That's a sweet 300 👍
Itza vera nica! I needsa to want one. (Now, where did I put my soldering iron?? 🎧
Nice job!
how many watt is the output? I am going to build this. thanks.
7W
Excellent design and build. I've been wanting to build a single-ended amp myself. I looked on the Toroidy website and the power transformer you used doesn't appear to be there. Was this a custom wind that they did for you?
yes. "If You need other output volatges, please contact Us by mail info@toroidy.pl ."
@@RobertZovko Ugh. Thank you. :)