Hello all !
I am planning to build a valve PP amplifier, around GU32 power tubes. Ideally I would prefer to use 6N2P/6N1P or 6N7S as I am having some of them already. On the other hand, any russian series tube will do.
I have been searching for schematics but couldn't find anything suitable.
Need to mention that I am looking to use 2XGU32 for each channel with paralleled sections.
Thank you in advance. 🙂
I am planning to build a valve PP amplifier, around GU32 power tubes. Ideally I would prefer to use 6N2P/6N1P or 6N7S as I am having some of them already. On the other hand, any russian series tube will do.
I have been searching for schematics but couldn't find anything suitable.
Need to mention that I am looking to use 2XGU32 for each channel with paralleled sections.
Thank you in advance. 🙂
I believe a GU-32 is the Russian Equivalent of the 832 tube.
The schematic in Post # 2 shows parallel grids, g1, and a very high return resistance to ground, 680k.
I expect that with 680k, the GU-32 might go into thermal runaway, and burn themselves out.
And g2 maximum voltage is 250V; but the schematic shows a 1k resistor from 290V going to g2 (probably lots more than 250V at g2.
The GU-32 is normally an RF tube.
You want to check the voltages and currents at warmup and during later time of operation, to be sure the tubes do not have reduced life, or even self destruct.
The schematic in Post # 2 shows parallel grids, g1, and a very high return resistance to ground, 680k.
I expect that with 680k, the GU-32 might go into thermal runaway, and burn themselves out.
And g2 maximum voltage is 250V; but the schematic shows a 1k resistor from 290V going to g2 (probably lots more than 250V at g2.
The GU-32 is normally an RF tube.
You want to check the voltages and currents at warmup and during later time of operation, to be sure the tubes do not have reduced life, or even self destruct.
The balance of the phase splitter in your schematic will not be so good. With only 1K as the tail, the tail is too short for a 'long tail phase splitter'.
Equivalents of the 832 and GU-32 are FU-32 (Chinese), QQE04/20 (Philips) and QQV04/15 (Mullard). Maybe searching on them turns up something.
I do have some schematics with 832 pp (like the two attached ones) but in none of them 6N1P's or 6N2P's are being used.
Equivalents of the 832 and GU-32 are FU-32 (Chinese), QQE04/20 (Philips) and QQV04/15 (Mullard). Maybe searching on them turns up something.
I do have some schematics with 832 pp (like the two attached ones) but in none of them 6N1P's or 6N2P's are being used.
Attachments
Thank both of you for your inputs on this. Still searching for some schematic.
Finally I might consider just modifying the output stage of an existing schematic and testing.
Regards
Finally I might consider just modifying the output stage of an existing schematic and testing.
Regards
if I remember correctly - around 7W. I have more capacity and CRC type filter in the power supply - no hum no noise.