6N6P in A2

[jcalvarez]

Hello everyone!

Has anybody tried a 6N6P in a SET setup with grid current? Will the grid handle ~50mW? I cannot find any information in the datasheets, nothing about operating the grid with positive voltage.

Regards,

 

[artosalo]

I once measured 6N6P and 6N6P-I with grid current up to +5 V. Attached the test data.
I have not tested 6N6P with A2 drive as SE, but built an AB2 amplifier. Normal AB1 gives some 3 W,
AB2 8 W with a single 6N6P. Attached a schematic and photo of that amplifier.

 

[jcalvarez]

I once measured 6N6P and 6N6P-I with grid current up to +5 V. Attached the test data.
I have not tested 6N6P with A2 drive as SE, but built an AB2 amplifier. Normal AB1 gives some 3 W,
AB2 8 W with a single 6N6P. Attached a schematic and photo of that amplifier.

That's very useful and interesting, thank you! Was that 8W peak or avg? That's a lot for just one 8W (4+4) bottle. What was the quiescent current and OPT impedance?
I'm waiting for my SE OPT, at the moment I "get" avg 5W from 2 bottles in LTSpice.

 

[Depanatoru]

Grid current AB2 is only usefull in push-pull , then you can get more power . Not sure what you want .

 

[jcalvarez]

Grid current AB2 is only useful in push-pull , then you can get more power . Not sure what you want .

Actually, there are many SET applications using A2, especially with big transmitting tubes. It is not specific to push-pull.

Update: I understand that AB2 is useless for SE. But my question was about A2. Artosalo kindly explained about his experience with AB2. But the plate current vs positive grid voltage data is exactly what I was after.

 

[artosalo]

Was that 8W peak or avg? ... What was the quiescent current and OPT impedance?

• Average power
• 35 mA total
• 10k

Attached my test memo. Just ask if all not clear with that document.

 

[jcalvarez]

• Average power
• 35 mA total
• 10k

Attached my test memo. Just ask if all not clear with that document.

That's very useful, thank you!