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!

Das oist toll, wenn wer noch die "alte" Technologie vollkommen beherrscht und auch in ein Meisterwerk umsetzen kann. Bravo!

WOW. LOVE this one too. looking mighty Awesome.. your craftsmanship deserves a big recognition.

Two of my favourite things. Video production and tube amps. Nice job on both.

Another stunning , handcrafted piece of kit. Very easy on the eye , to be sure ! Nice work !

That amp is a work of art. Form meets function so beautifully. Wish I had your skills.

Predivno konstruirano i odrađeno. Za divljenje! Svaka čast!

What a STUNNING piece of work. Wish I had your mad skills!

What a beautiful piece of craftsmanship sir.

A work of art, inside and out.

Kao i uvek... bravo. Odlicna izrada. 👍👍👍

Wow, they are some real nice looking Freq response curves there bro. Congrats

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.

@naleenperera1969

Жыл бұрын

Obviously It Is..................👍

Keep posting these videos, love them

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.

@RobertZovko

3 жыл бұрын

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.

That is absolutely beautiful!

Nice amps you made 👍 i love them!

This is very cool piece of art. Thanks for sharing.

Well done. No expense is spared.

SVAKA CAST , VEOMA LEPO I PEDANTNO. 👌

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! 😀

Wow that is absolutely beautiful

I'm going to give building this a go. Cheers for the inspiration!

awesome work😊

Wow, just amazing! 😮👏

Felicitari maestre !

Pekná práca závydím

It's a piece of art.

thanks it's a joy to watch this video

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.

@aerofart

3 жыл бұрын

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?

@RobertZovko

3 жыл бұрын

@@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 ...

@aerofart

3 жыл бұрын

@@RobertZovko looking forward to seeing the updates!

merci pour cette vidéo, du super travail, bravo

What power level were your measurements at? Noticeable HF distortion in the waveform.

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!

@foureyedchick

3 жыл бұрын

Pojacavac BEZ izlazni transformator! Nema harmonicnu distorciju od njih. Odlicino.

Great job done

beautiful!

Amazing fact!

Robert meu amigo, sou seu fã!!! parabéns pelo projeto

@RobertZovko

3 жыл бұрын

Obrigado

Oh man, I drooled.

Me encanto. Simplemente hermoso

Looks amazing! The only thing I would change is the blue led screen.

So beautiful 🎉🎉🎉

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

@robertmeyer7664

Жыл бұрын

I bet you easily sell 300 units

Odlično.

it is art

Beautiful 🌹

Impressive. Is the sound as faithfully reproduced as the build is well proportioned?

Qualità prezzo. Ultra. Top. E si può anche. Modificare. Migliorando. Dentro ❤. Ottimo acquisto.

6DE7 , OTL amp ,usei trafo de fonte adaptei saída 600ohm,8 ohm ,diferença de impedância é pouca ficou bom , saiu barato abraço .

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

@RobertZovko

4 жыл бұрын

Sljedeće je PP pojačalo. Što se tiče opreme ništa vrijedno spomena. Hvala

@7:50, what are those black trays holding the tube socket called?

@RobertZovko

3 жыл бұрын

Tube Shock Proof Plates

Hi Robert, awesome work! What kind of liquid do you use for the laser markings?

@RobertZovko

Жыл бұрын

Just search: "laser marking spray"

SO NICE. Robert, what is your method for cutting the stainless panels so perfectly? Love those rounded edges

@RobertZovko

3 жыл бұрын

CNC

What an amazing work. That turned into a Master Pc. Wonder how it sounds and how much it costs to order.

Where could I find detailed schematics, nominals of condensers and resistors, other elements and description of final tuning?

@RobertZovko

3 жыл бұрын

I will set up a new scheme soon. kzread.info?event=video_description&redir_token=QUFFLUhqbm5FR1JsX3pRakZ3TG5obDROY05EMlB0ak5wUXxBQ3Jtc0trYWtvQmxqcEMxbEhPcm5TVHA5UThNT2dLSjl6REhwZmtLalRBQm1HNmxpZ0FBX2hjUm95R0lDTVlLZ0t5OXNBdUZMTzlEbVR0Nk1zRmEtVDZaNlpkTVlsVGpIanhVSlVGcGFBR2ppXzhkZEhpTlYtVQ&q=https%3A%2F%2Fdrive.google.com%2Fdrive%2Ffolders%2F1SN8fLlPXu_aaPHYIuotFU-5UOQsk7wXx%3Fusp%3Dsharing

Great Great work. Btw, what's that bias circuit you use there?

@RobertZovko

3 жыл бұрын

Standard fixed biasing if that's what you mean.

Polish transformers 😁👍👏😍

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?

@RobertZovko

4 жыл бұрын

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.

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 ??

@RobertZovko

3 жыл бұрын

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 ...

@wibblebinx

3 жыл бұрын

@@RobertZovko Thank you very much .. Tube-Town delivers to my country .. I will let you know how I get on .:))

@Nord55

3 жыл бұрын

Troy Dale also TAD (tube amp doctor) is based in Germany and should deliver to EU

I would like to know which software you use for design and simulation. Great stuff btw.

@RobertZovko

3 жыл бұрын

ltspice, you can download the model (link is in the description)

@robrommens660

3 жыл бұрын

Thank you very much

Interested here. How much?

Hi, Robert! Nice peace of art. Any chance to get some references that I would be able to find full scheme of this amplifier?

@RobertZovko

2 жыл бұрын

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

@RobertZovko

2 жыл бұрын

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.

Which are the best valves for single ended?

@RobertZovko

Жыл бұрын

A difficult question without an objective answer. You have to try some of them to find out which works best for you...

What is the name of the instrumental song and artist, at the start of the video, please?

@RobertZovko

3 жыл бұрын

Please see the end of the video, I wrote there.

Hvala ni videu, fino gledat kad majstor svog zanata nešto radi. Jeli samo za sebe pravite ili primate narudžbe? Veliki pozdrav.

@RobertZovko

2 жыл бұрын

Samo za svoj odmor. Hvala

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?]

@RobertZovko

3 жыл бұрын

See laser marking spray

How did you connect the remote volume control?

@RobertZovko

3 жыл бұрын

it connects like any other potentiometer, the only difference is the AC power supply of about 9V

@Al-bd8hm

3 жыл бұрын

@@RobertZovko Thanks for your response. I know that part. My question is for the relay on and off.

@RobertZovko

3 жыл бұрын

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.

The voltmeter is from Aliexpress? Do you have a link? Thanks..

@RobertZovko

3 жыл бұрын

a.aliexpress.com/_mt2Eixd

@and1424

3 жыл бұрын

@@RobertZovko thanks!

Hi. Beautiful. Do you sell those kits?

@RobertZovko

3 жыл бұрын

No, but thanks for asking.

@ramilrodriguez8340

3 жыл бұрын

@@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.

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.

@pauljanssen2624

3 жыл бұрын

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

@RobertZovko

3 жыл бұрын

I would not recommend such a connection method, for safety reasons. True a transformer is more expensive, but it is not from human life.

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 😀

@RobertZovko

4 жыл бұрын

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.

Too good for KZread

Nice construction. I was expecting better low frequency. It is missing some DC regulation or feedback...

Wonderful work!!! How many watts?

@RobertZovko

3 жыл бұрын

7-8W without clipping

@nvmldnsnm

3 жыл бұрын

@@RobertZovko Are you selling the amps?

@RobertZovko

3 жыл бұрын

@@nvmldnsnm No, but thanks for asking.

Possibile have a kit?

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.

@RobertZovko

4 жыл бұрын

Napajanje je izvedeno sa kondenzatorskim djeljenjem napona što je samo po sebi dovoljno.

@munja2111

4 жыл бұрын

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?

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 :).

@RobertZovko

3 жыл бұрын

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).

@tomekkruger

3 жыл бұрын

​@@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 :)

I need this but for dummies :D.

@RobertZovko

3 жыл бұрын

From the beginning, I try to make sure that everyone can make these amplifiers. It couldn't be simpler.? :D

Браво, каква е изходната мощност и оптималния изходен импеданс?

@RobertZovko

Жыл бұрын

7W, min 8 Ohm

@boriskolev9513

Жыл бұрын

@@RobertZovko a какъв е максималния импеданс в изхода и измервал ли си каква е връзката между импеданса на товара и изходната мощност?

@RobertZovko

Жыл бұрын

@@boriskolev9513 nisam mjerio, ali imate priloženu simulaciju u LTspice koja dobro pokazuje odnose između impedancije i izlazne snage

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

@RobertZovko

3 жыл бұрын

Hvala na lijepim riječima. Pogledajte na Internetu laser marking spray, imate sprej, što je još jednostavnije za rad.

@petarbursac76

3 жыл бұрын

@@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.

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.

@RobertZovko

3 жыл бұрын

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.

Why you dont sell this amps

@RobertZovko

Жыл бұрын

thanks for the question, but I don't sell amplifiers...

套件怎购买

@RobertZovko

3 ай бұрын

我不卖扩音器。 谢谢你的慰问。

@cijkgcijkggg7967

3 ай бұрын

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

@RobertZovko

Жыл бұрын

?

@RobertZovko

Жыл бұрын

English please

Fantastic, my respect!