• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

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52B and 300B electronic tube power amplifier duai-purpose macgine.
 

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Milen

Member
2007-04-30 12:12 am
Sofia
Integrated TVC attenuator and E810F pentode phono
 

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jcalvarez

Member
Paid Member
2021-04-16 4:57 pm
Dunfermline, UK
I see that as inspiration to put down the soldering iron for a while.

That's a very clean and straightforward looking build and does exactly what it needs to do -- amplify sound. Any other pics from underside and back? Keep it coming.
Thank you for your kind words!
Here are some more pics. I'm not the tydiest builder in the world, so please go easy on me 😁
Hmmm, pics did not get attached, let me try again
 

jcalvarez

Member
Paid Member
2021-04-16 4:57 pm
Dunfermline, UK
Awesome, but seriously, what do you do for a living? That is some nice equipment you have going for a hobbyist. You do work for financial institutions and IT in the UK?
Where do I start...
Physicist by education (Odessa State University), sold to the capitalists in 96 because science was not paying the bills, since them working for companies that design and manufacture Point Of Sale terminals (a.k.a credit card machines in the UK). Mostly as a system engineer, 90% software, 10% hardware. That job pays for the hobby.
 

jcalvarez

Member
Paid Member
2021-04-16 4:57 pm
Dunfermline, UK
Digital work, analogue life. Nice. What's the next tube project going to be? Pre-amp?
I've been thinking about building a single ended amp, triode based. But I want something straightforward and cheap, no fancy tubes like 300B or those high voltage monsters like GM-70 etc. I've got a bunch of 6N6 triodes, been simulating in LTSpice, looks like I can get 10W from 4 tubes in parallel with a 6N2P driver, with reasonable distortion. But simulation is one thing, real build will probably be more challenging. Also, decent single ended transformers are not cheap. Will probably make a prototype first.
 
I've been thinking about building a single ended amp, triode based. But I want something straightforward and cheap, no fancy tubes like 300B or those high voltage monsters like GM-70 etc. I've got a bunch of 6N6 triodes, been simulating in LTSpice, looks like I can get 10W from 4 tubes in parallel with a 6N2P driver, with reasonable distortion. But simulation is one thing, real build will probably be more challenging. Also, decent single ended transformers are not cheap. Will probably make a prototype first.

How about the 6C33?
 
6CK4 octal base triodes. Two per single ended channel.
They do work great in push pull, but single ended should work well too.

Save money . . .
Take a medium to large sized used Push Pull output transformer, remove all the E and the I laminations.
Re-stack all the E's on one side, put a layer of Kapton tape (or other tape) on the open end of the E's, and stack all the I's on the tape.
(Kapton tape becomes the air gap).

Have fun building and listening to a single ended triode amplifier.
 

jcalvarez

Member
Paid Member
2021-04-16 4:57 pm
Dunfermline, UK
6CK4 octal base triodes. Two per single ended channel.
They do work great in push pull, but single ended should work well too.

Save money . . .
Take a medium to large sized used Push Pull output transformer, remove all the E and the I laminations.
Re-stack all the E's on one side, put a layer of Kapton tape (or other tape) on the open end of the E's, and stack all the I's on the tape.
(Kapton tape becomes the air gap).

Have fun building and listening to a single ended triode amplifier.
Interesting... I may end up doing that, thank you!
It may be challenging to find a cheap used PP with the right impedance though. Time for some e-Bay browsing.
----
Just looked around for 6CK4, nothing in the UK, all options are from the USA, cheapest around £22 delivered. Pity because it looks like an interesting tube.
I have also looked at the 6N13, but I get better simulation results with the 6N6. Real build may be different though.
 
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jcalvarez

Member
Paid Member
2021-04-16 4:57 pm
Dunfermline, UK
SE in not a complicated tube and straightforward design?

Check out George at tubelab and his website (he has a forum here also under the manutacturers/vendor section) and his SimpleSE (SSE). KT88, EL34, and 6550 if you want to push it. The KT88 and EL34 setup does the trick for me and you can switch between the two.
Thank you, had a look there some time ago. Is all good, but I'm fixed on using triodes, not pentodes/tetrodes in triode mode. I'm not saying they are not good, but is not what I'm looking for. Also I want sometbing easy to drive, no mosfet drivers, no class A2. A CCS is fine though 😁
 
The 845 tubes SE design scheme
 

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