6AU6 replacement
 

Hi,
I'm in a pickle. I'm in the middle of building a 6V6 push pull mono amp with one 12AU7 and two 6AU6. I just realized I don't have any 7BK tube sockets but have some 9A sockets. So I'm trying to find a sharp cut off pentode in a 9 pin socket with the same characteristics as a 6AU6. Any help would be appreciated. Here's the schematic I'm working off.

http://www.freeinfosociety.com/elect...ew.php?id=2394

Should not be hard to get the required sockets in about the same time frame as any alternative to the 6AU6A which you probably also do not have on hand. Changing to a different type of tube may require some additional tweaking.

thanks for your quick response kevinkr. I have hundreds of tubes, lots of time and no money to put into this project. So if I can get a couple of possibilities the chances are good I already have the tubes.

What topology are you using it in?

What plate current?

B+ is 460v (unloaded)
what do you mean by topography? You'll have to forgive me this only the second tube amp I've built so I'm a little green.
thanks

EF86? they're cheap for good NOS and can be found in many leak circuits..... triode all the way for me. :)

The complete analog is 6SJ7, but it has octal socket. In 9 pin bulb most probably 5879 is the closest one.

Did you copy the power supply from the schematic you posted? That poor little 5Y3.:crying:

jeff

Tube Lore says it is based on 6SH7, another octal tube.

vinylkid 58: Yes I did, I've pretty much copied that schematic exactly. It looked simple and I thought it might be fun to give it a try. What do you think would be a better choice. Actually if there are any improvements that wouldn't be too far off the original, I'd be willing to try it. It's all just an experiment to me. wavebourne, morinix thanks for your suggestions I take a look at them. thanks