How to use Russian tube 6H6

[soundbrigade]

Arrrrrrrrrrrrrrrgh! That was a lot ohms ........

Well such a transformer will be hard to find. BUT while looking for physically small amps I ran into this:
A_QRPS . I thing the 12BH7A is an equivalent to 6N6P.

 

[Zibi]

http://www.hammondmfg.com/125a.htm

 

[Zibi]

http://www.hammondmfg.com/cldist_intl.htm#Sweden

 

[adason]

I know this is an old thread...
Soundbrigade, have you built anything with those Russian 6N6P dual triodes? I have quite a few of these. Just for fun I used one dual in parallel as output tube with small SE output transformer, and it worked fine and sounded ok. Good as headphone amp, perhaps.
Did anyone tried to use these in OTL amp? Like those Bruce Rozenblit made with tv tubes? I could experiment with parallel tubes, even if it would have just a cap on output, but I do not want to spent too much time experimenting. Is there any schematics for OTL, I think Tim de Paravicini did something like that. Anyone?

 

[fdegrove]

Hi,

Is there any schematics for OTL, I think Tim de Paravicini did something like that. Anyone?

Could you be confusing De Paravicini for Futterman?
AFAIK, Tim D.P. is a output xformer expert.

Either way, The Futterman is a complex circuit and there are better suited valves for this purpose.

Cheers, 😉

 

[adason]

No, i did not mean futterman, you are right, it could not be tdp. I am pretty sure i have seen an amp at some audiofest done with many small signal tubes on the output. However i may be wrong, and it still could have had trafo on the output.
When i find it, i will scan rozenblits circuit, if it can be modified.

 

[barretter]

Tim de Paravicini did make a power amplifier with many ECC83s in parallel but it was transformer coupled.

 

[adason]

Ha, thats what i remembered then. Thanks barretter.
Problem with many parallel 6N6Ps may be quite a current for heaters required.
Once i have output trafos, i will experint with two per channel first.

 

[TonyTecson]

for multiple output tubes series parallel operation of heaters can be used...

 

[adason]

Some edcor trafos arrived, so I made simple se amplifier with 6H6P (6N6P) one dual triode per channel. I got some help from lampizator (thanks Lukasz). It works reasonably well. Here are some pics.

 

[adason]

and some test results...I do not know how much watts it can make, but plenty for normal listening, and especially for headphones
It is reasonably flat, -5dB from 30 Hz to 15 kHz, with small hump at 120 Hz, and slowly rolling of below 100 Hz.
It has very low noise (no preamp tube), at about -100 dB, and it is quite clean, respectable at ~0.107% at normal listening level.

 

[adason]

for multiple output tubes series parallel operation of heaters can be used...

that is exactly what I tend to do, like now I have 12V DC power supply on two tubes in series...however, it is not going to cut down the power needed after all

 

[Koifarm]

I know this is an old thread...
Soundbrigade, have you built anything with those Russian 6N6P dual triodes? I have quite a few of these. Just for fun I used one dual in parallel as output tube with small SE output transformer, and it worked fine and sounded ok. Good as headphone amp, perhaps.
Did anyone tried to use these in OTL amp? Like those Bruce Rozenblit made with tv tubes? I could experiment with parallel tubes, even if it would have just a cap on output, but I do not want to spent too much time experimenting. Is there any schematics for OTL, I think Tim de Paravicini did something like that. Anyone?

I have 6n6p parallel in OTL for headphone amp. Same schematic as below but then i used 6n6p. Anode voltage is 200v. And if you need some amplification ad a 6n6p srpp stage.

 

[adason]

Koifarm, that is precisely what I am looking for...except I would like to drive high efficiency (98dB) speakers with it, so paralleling more tubes would be the way to go. I got plenty of those 6N6Ps. Thanks for the schematics.

 

[rotaspec]

I have 6n6p parallel in OTL for headphone amp. Same schematic as below but then i used 6n6p. Anode voltage is 200v. And if you need some amplification ad a 6n6p srpp stage.

Hi Koifarm. Would you mind PM me the whole CDT100 diagram if you have it. A friend has both this and the CDT200 that he would like to modify (or repair in the case of the faulty 200).
We have not been able to obtain info on these players.

It would be much appreciated.

Gary.

 

[Koifarm]

Rotospec you have a PM.

 

[Tyimo]

Hi Koifarm!

I have 6n6p parallel in OTL for headphone amp. Same schematic as below but then i used 6n6p. Anode voltage is 200v. And if you need some amplification ad a 6n6p srpp stage.

Could you give some informations about that amplifier?
- input/output impedance?
- How many power has it?
- What would be the optimal load?
- etc....🙂
Greets:
Tyimo

 

[BVG]

Some edcor trafos arrived, so I made simple se amplifier with 6H6P (6N6P) one dual triode per channel. I got some help from lampizator (thanks Lukasz). It works reasonably well. Here are some pics.

adason, could you please post the schematics with the final component values?

 

[adason]

Sorry for delay, i unsubscribed from all threads, i was not aware of this request

 

[adason]

here it is...