Build of OTL tube (valve) amplifier
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- Опубликовано: 27 авг 2024
- This is my attempt to build an OTL tube amplifier according to the Japanese scheme. I used, NOS Soviet electronic tubes, the output tubes are 6N13S (6H13C) replacement is 6AS7, 6AS7GA, 6080 ..., the drivers are 6N6P replacement is 6CG7 ... and the preamp is 6J4P replacement is 6AU6.
As the amplifier I use for the drive and headphone, voltage filtering must be exceedingly good, without a choke the filter capacitors must be significantly bigger. I had to perform the power supply of the preamp heater with DC power supply, otherwise it has too much noise (too compact design or is it a matter of electronic tubes?).
Download link for schematics, LTspice model (OTL 6N13S.asc, tube.inc), photos:
drive.google.c...
This is better watching than anything on TV or paying to go to watch a number 1 box office movie.
The skill is what the world needs.
I am inspired.
And I am 59.
Thank you.
As a university student who is also learning to be an electrical engineer, i really appreciate the craftsmanship that went into this build. Thank you for sharing!
WOW. LOVE this one too. looking mighty Awesome.. your craftsmanship deserves a big recognition.
Das oist toll, wenn wer noch die "alte" Technologie vollkommen beherrscht und auch in ein Meisterwerk umsetzen kann. Bravo!
Two of my favourite things.
Video production and tube amps. Nice job on both.
That amp is a work of art. Form meets function so beautifully. Wish I had your skills.
A work of art, inside and out.
What a STUNNING piece of work. Wish I had your mad skills!
Predivno konstruirano i odrađeno. Za divljenje! Svaka čast!
What a beautiful piece of craftsmanship sir.
Another stunning , handcrafted piece of kit.
Very easy on the eye , to be sure !
Nice work !
What a beautiful peace of equipment!!! It reminds my times wen I was a WI FI fan in the 1950's.
You forget to post the frequency band width and distortion percentage harmonic and intermodulation, I would like to compare with what I had designed and built with different types of tubes and also OTL circuits, I remember the best in specs was one amplifier using EL34's in series parallel arrangement identical to your amplifier in the post with 6AS7's. I designed and built a stereo amplifier with 4 tubes
6080 in an identical circuit OTL, but for speaker systems of 16 ohms. I was my best one.
Thanks for the comment. The frequency response is attached in the video (-3dB 10Hz-30kHz), and as for other measurements, with my equipment I am not able to give accurate data so I omit it. Greeting.
Thank you so much for share this with us. I dream about being a specialist in audio electronics and your talent is really inspiring. Greetings from Brazil.
Obviously It Is..................👍
Wow, they are some real nice looking Freq response curves there bro.
Congrats
Keep posting these videos, love them
Zdravo: Ovo je prvi pojacavac sa cevima sto sam ikad videla sto nema izlazne transformatore. Transformatori kvare izlazne signale, i tranzistorski pojacavaci ih nemaju. Odlacni vidio! 👍 Produzi sa odlicnim tehnicnim projektima! 😀
Well done! Gorgeous build. I really like your attention to deal and craftsmanship. Great use of high tech and low tech to bring it all together. Just one tiny criticism: you should have cleaned the rosin residue off the solder joints for a more hand-crafted, polished look.
Also, seems distortion was apparent at 20kHz. Was this at the final output stage? Do you know why? Have you done any fine tuning since the video?
@@aerofart I finished the changes on this amp, mostly on the power supply. The video is not finished yet, but I plan it in a month, two ...
I will set the power scheme for download earlier ...
@@RobertZovko looking forward to seeing the updates!
That is absolutely beautiful!
Kao i uvek... bravo. Odlicna izrada. 👍👍👍
Well done. No expense is spared.
thanks it's a joy to watch this video
awesome work😊
Thank you for getting back to me
You should put a kit together or sell printed circuit if lots of hasle
Or sub for a company to build them
Take orders on prepaid items only
I bet you easily sell 300 units
Qualità prezzo. Ultra. Top. E si può anche. Modificare. Migliorando. Dentro ❤. Ottimo acquisto.
Nice amps you made 👍 i love them!
Looks amazing! The only thing I would change is the blue led screen.
SVAKA CAST , VEOMA LEPO I PEDANTNO. 👌
It's a piece of art.
This is very cool piece of art. Thanks for sharing.
I'm going to give building this a go.
Cheers for the inspiration!
Felicitari maestre !
Poštovani Robert, ovo je bio pravi užitak za gledati !! Siguran sam da i jednako dobro zvuči! Elektronika je od malih nogu bila moja tiha patnja. Nažalost, nemam tog obrazovanja. Ali zato mogu biti audiofil :) Puno pozdrava!
Pojacavac BEZ izlazni transformator! Nema harmonicnu distorciju od njih. Odlicino.
Wow that is absolutely beautiful
6DE7 , OTL amp ,usei trafo de fonte adaptei saída 600ohm,8 ohm ,diferença de impedância
é pouca ficou bom ,
saiu barato abraço .
merci pour cette vidéo, du super travail, bravo
Oh man, I drooled.
Wow, just amazing! 😮👏
Amazing fact!
What power level were your measurements at? Noticeable HF distortion in the waveform.
Svaka čast za sva 3 pojačala što ste napravili. Nadam se da ćete nastaviti još, vjerujem da je prezanimljiv hobi. Kakva vam je ostala oprema? (Gramofon, cd, dac, zvučnici) Pozdrav iz Makarske
Sljedeće je PP pojačalo. Što se tiče opreme ništa vrijedno spomena. Hvala
Nice construction. I was expecting better low frequency. It is missing some DC regulation or feedback...
Pekná práca závydím
Hvala ni videu, fino gledat kad majstor svog zanata nešto radi. Jeli samo za sebe pravite ili primate narudžbe? Veliki pozdrav.
Samo za svoj odmor. Hvala
Polish transformers 😁👍👏😍
So beautiful 🎉🎉🎉
another masterpiece from Mr Zovko ... thanks ... i'd be most grateful for some info on how to coat those metal panels with something that looks like white paint that when washed away after Co2 laser leaves behind the crisp black lettering as i need to do the same [or maybe a link to a product that was used?]
See laser marking spray
Hi Robert, awesome work!
What kind of liquid do you use for the laser markings?
Just search: "laser marking spray"
Robert, I really enjoy your channel and your videos are clear and easy to follow. A couple of questions If I may .. 1) Where do you source your tubes 2) I am a complete novice to electronics building which of your builds would be the easiest to start with ??
Thanks for the nice words. First, I’m a beginner myself (at least as far as tube amps are concerned) so I would recommend just the first amp I made (KT88). I don't know where you live, but here in the EU I buy electronic tubes in Germany (Tube-Town Store, Banzai Music ...), Slovakia (NOS Soviet) and on Ebay ...
@@RobertZovko Thank you very much .. Tube-Town delivers to my country .. I will let you know how I get on .:))
Troy Dale also TAD (tube amp doctor) is based in Germany and should deliver to EU
Is there a way to build a tube amp without a power transformer, that use tubes with series filaments that add up to 120-volts or tubes with 120-volt filaments (I am in North America where 120-volts is used)? The transformers are very expensive and hard to find.
By the way, you did an excellent job and have great craftsmanship.
You can always take a 120v and have an output of 220 to #240 you and only double the amperage on your 120 side and a tad bit more
I would not recommend such a connection method, for safety reasons. True a transformer is more expensive, but it is not from human life.
Great job done
SO NICE. Robert, what is your method for cutting the stainless panels so perfectly? Love those rounded edges
CNC
What an amazing work. That turned into a Master Pc. Wonder how it sounds and how much it costs to order.
Me encanto.
Simplemente hermoso
Robert meu amigo, sou seu fã!!! parabéns pelo projeto
Obrigado
Hi, Robert! Nice peace of art. Any chance to get some references that I would be able to find full scheme of this amplifier?
www.asahi-net.or.jp/~cn3h-kkc/claft/6as7otl.htm
www.furo-visu.com/s_otl/6AS7_otl.html
www2u.biglobe.ne.jp/~hu_amp/6080otl.htm
A year ago I made a new version with a better power supply, now it is in the testing phase. I will post the diagram and video soon.
The circuit looks like a Peterson-Sinclair output stage. Heating the lower 6N13S is better to do with a separate winding polarized -160V with respect to the ground I think :).
As for the scheme I’m not sure whose idea it is. And as for heating, I definitely agree that the better solution is to heat the lower tubes especially the lower ones especially the upper ones compared to +160V and -160V, but to simplify the wiring I used zero as a reference point (more possible hum).
@@RobertZovko My words are not criticism. I found that a better solution would be to separate the heaters. But the circuit itself is OK, a bit related to push-pull transistor solutions. Solutions like yours, Mr. Zovko, wil work better with high load impedance. I can see power triodes connected in parallel so they can run with reduced load impedance. Good job. The layout is thought out :)
Impressive. Is the sound as faithfully reproduced as the build is well proportioned?
Great Great work. Btw, what's that bias circuit you use there?
Standard fixed biasing if that's what you mean.
I would like to know which software you use for design and simulation. Great stuff btw.
ltspice, you can download the model (link is in the description)
Thank you very much
Postovani Robert, ja isto pravim pojacala al u sv9m zivotu nisam video ovako savrsenstvo kao sto vi radite. Vi ste umetnik. Morao bih vas pitati za jedan savet. Ona plocica sto se je engraving pa onda oprali pod vodom, kako se zove taj materijal. Meni je kod pravljenja pojacala najve i problem napraviti front face. Ako vam bilo sta treba od materijala iz Australije slobodno mi se javite.
Pozdrav,
Petar Bursac
Melbourne, Australia
Hvala na lijepim riječima. Pogledajte na Internetu laser marking spray, imate sprej, što je još jednostavnije za rad.
@@RobertZovko puno vam hvala na odgovoru, mnogo ste mi pomogli. Da li bi ste mi mogli preporuciti neki laser engraver koji bih mogao koristiti. Gledao sam na internetu ima ih mnogo a vecina nije za metal. Ako vam treba nesto od komponenti iz australije javite mi se. Mogu vam preporuciti prouzvodjace transformatora iz kine od kojih ja nabavljam. Hammond trafo od 200 dolara kupim od njih za 6 dolara i cak je boljeg kvaliteta i maki je lakovse uklapa u sasiju.
The voltmeter is from Aliexpress? Do you have a link? Thanks..
a.aliexpress.com/_mt2Eixd
@@RobertZovko thanks!
it is art
beautiful!
Odlično.
Prekrasna samogradnja, vrlo profesionalno napravljeno sa kvalitetnim komponentama. Ozicenje je divota za gledati, kutija je umjetnicko djelo. Jedino sta mi bode oci i kvari ljepotu je digitalni mjerac za bias, ja bi stavio terminale pa spojio vanjski instrument. Jel vi ta pojacala prodajete ili ih radite za sebe? Mene lupa ideja da si slozim SE 300B ili SE KT88. Gledao sam Vasa videa a i citao po forumima pa se mozda i upustim u samogradnju. Hvala na videu 😀
Stavio sam terminale, ali je jednostavnije da je instrument u njemu. Prvo sam projektirao sa analognim ali su preveliki u odnosu na cjelinu. Ne vidi se toliko kad je ugašen.
Where could I find detailed schematics, nominals of condensers and resistors, other elements and description of final tuning?
I will set up a new scheme soon.
ruclips.net/user/redirect?event=video_description&redir_token=QUFFLUhqbm5FR1JsX3pRakZ3TG5obDROY05EMlB0ak5wUXxBQ3Jtc0trYWtvQmxqcEMxbEhPcm5TVHA5UThNT2dLSjl6REhwZmtLalRBQm1HNmxpZ0FBX2hjUm95R0lDTVlLZ0t5OXNBdUZMTzlEbVR0Nk1zRmEtVDZaNlpkTVlsVGpIanhVSlVGcGFBR2ppXzhkZEhpTlYtVQ&q=https%3A%2F%2Fdrive.google.com%2Fdrive%2Ffolders%2F1SN8fLlPXu_aaPHYIuotFU-5UOQsk7wXx%3Fusp%3Dsharing
Great fine work!. Specs and price could be?.
Thanks and congrats!
I need this but for dummies :D.
From the beginning, I try to make sure that everyone can make these amplifiers. It couldn't be simpler.? :D
Beautiful 🌹
Wonderful work!!! How many watts?
7-8W without clipping
@@RobertZovko Are you selling the amps?
@@nvmldnsnm No, but thanks for asking.
@7:50, what are those black trays holding the tube socket called?
Tube Shock Proof Plates
Браво, каква е изходната мощност и оптималния изходен импеданс?
7W, min 8 Ohm
@@RobertZovko a какъв е максималния импеданс в изхода и измервал ли си каква е връзката между импеданса на товара и изходната мощност?
@@boriskolev9513 nisam mjerio, ali imate priloženu simulaciju u LTspice koja dobro pokazuje odnose između impedancije i izlazne snage
Too good for RUclips
Interested here. How much?
Hello Robert, can you please give more information about the volume control (kit), the remote control and the relay circuit. Where can I buy this kit / components or where can I get the source code for the regulation / control?
IR remote can be purchased on ebay, aliexpress ... www.aliexpress.com/item/32777966990.html?spm=a2g0s.9042311.0.0.27424c4djXZ6qv
Reley is for the Arduino, and a timer can be purchased at the aforementioned sites. However, in the end you do not need it (relay + timer), it is enough to buy a timer with a relay.
www.aliexpress.com/item/32842803323.html?spm=a2g0s.8937460.0.0.520c2e0eotipnR
My intention was to turn off one channel while setting up another when tuning. It turned out that it was not necessary as seen in the video.
Which are the best valves for single ended?
A difficult question without an objective answer. You have to try some of them to find out which works best for you...
Hi. Beautiful. Do you sell those kits?
No, but thanks for asking.
@@RobertZovko 😞😞. Nice work. I build guitar amps but want to get a good HiFi kit to build me a hifi tube amp to play my music. Again, beautiful. Blessings.
Possibile have a kit?
Why +/- 0.5 Volts on the output? It is too much, you should hear huge pop sound in HP or speakers, and dc current flow through them.
Max. 0.5V will not cause a massive click in the speaker. Of course it is better to be as close to 0V as possible.
How did you connect the remote volume control?
it connects like any other potentiometer, the only difference is the AC power supply of about 9V
@@RobertZovko Thanks for your response.
I know that part. My question is for the relay on and off.
I’m just finishing up another version of an OTL amp that only has a 30s timer. In the old version relay switches off one channel for easy adjustment of current and balance, but it turned out that it was not necessary, the amplifier is easily set and with both channels.
What is the name of the instrumental song and artist, at the start of the video, please?
Please see the end of the video, I wrote there.
Dali koristite nekakvu zastitu za zvucnik ili slusalice u slucaju sa se poremeti balans pa da dodje na izlaz previsoka razina DC napona. To je uvijek rizik kod OTL konfiguracije. Malo mi djeluje rizicno spojit skupe zvucnike ili slusalice na pojacalo koje moze davati DC komponentu na izlazu.
Napajanje je izvedeno sa kondenzatorskim djeljenjem napona što je samo po sebi dovoljno.
Tocka M2 pliva u zraku u odnosu na zemlju. Ako je sve idealno balansirano kad nema inputa taj izlaz bi trebao biti na 0V gledano sa istosmjerne komponente. Ali lampe nisu idealne i moze se pojaviti debalans. Jel imate DC komponentu u tocki M2 i dali je ona znacajna da moze spalit zvucnike ili slusalice. Koliko ja citam shemu na M2 se moze pojavit DC komponenta. Ili sam nozda u krivu?
Why you dont sell this amps
thanks for the question, but I don't sell amplifiers...
套件怎购买
我不卖扩音器。
谢谢你的慰问。
香港
The music was distracting 🤯
Less music, more talking. There's all sorts of things that you should be talking about. Why you pick the specific tubes you did, the same for the transformers. How you routed everything, the list goes on and on. It's a pretty amp but nobody can build it because you gave no real information on how other than some pretty picture,s and some silly editing. Somebody had to say it. I'd love to build this amp there's no way in hell I'm going to invest in parts for an amp when all I have going is a picture video and a quick schematic.
I Just Sub &_Like your chanel. Goodluck!
Havalaz mahabarataz mandarriaz vergoñaz
?
English please
Fantastic, my respect!