Using a 12AT7 as a gain stage.

[scottl]

I was wondering if any of the forum experts could chime in with some suggested plate/cathode values for a 1 triode 12TA7 recovery amp gain stage. I can have anywhere from 320v to 380v on the plate supply. It is at 350v currently. Right now all is good and I have a 100k plate and 1.5k cathode resistor. But, this is probably not optimal for the AT7. What do you think about lowering the plate resistor to a 47k? Better since the internal plate resistance is 11K?? What about target cathode voltage? Maybe 5v is the loadline ballpark??

ANy help is appreciated.

Thanks!

[Blue Strat]

I'd have to break out data books, etc to do this.

Question: Recovery from what?

[scottl]

Hi Mike!

I am using the 12AT7 for a 1 tube reverb design. 1/2 triode to drive the tank and 1/2 to recover. I like this a lot more than a 12ax7. The reverb is much more natural. Just looking for some suggested values as I have the 12AX7 vlaues on the recovery stage now. Sounds decent and I have enough gain to recover. But, maybe it could be a lot better.

Thanks!

I'd have to break out data books, etc to do this.

Question: Recovery from what?

[mlp-mx6]

Scott - long time, bud!

Take a look at the effects loop schem I sent you a long time ago. A 12AT7 is the recommended tube for that loop, so the recovery amp on that would be very similar to what you're looking for.