ampage Tube Amps / Music Electronics	For current discussions, please visit Music Electronics Forum.

ampage archive

Vintage threads from the first ten years

previous: anonymous I'm talking about the plate voltage... -- 4/6/2004 11:19 PM

Re: Effect of voltage on preamp tubes...Marshall

4/7/2004 3:33 PM
RedHouse	Re: Effect of voltage on preamp tubes...Marshall So is J Payant and "anonymous" the same person? Anyway, looking over my stash of Marshall schem-o's I see that besides the '76 JMP 2204 (not the cascaded pre-amp 2204) all the preamp plate resistors are the same 100k (the '76 2204 had 330k on V2a), so then I thought maybe you mean the B+ dropping resistors as they feed the preamp sections, but these also are the same 10k/1w (50w) and 20k/3w (100w). There was a thread a while back (subject: "best voltages for blues") that addressed preamp tube voltages check that out, Bruce in particular had some interesting observations.

4/7/2004 3:33 PM

RedHouse

Re: Effect of voltage on preamp tubes...Marshall

So is J Payant and "anonymous" the same person?

Anyway, looking over my stash of Marshall schem-o's I see that besides the '76 JMP 2204 (not the cascaded pre-amp 2204) all the preamp plate resistors are the same 100k (the '76 2204 had 330k on V2a), so then I thought maybe you mean the B+ dropping resistors as they feed the preamp sections, but these also are the same 10k/1w (50w) and 20k/3w (100w).

There was a thread a while back (subject: "best voltages for blues") that addressed preamp tube voltages check that out, Bruce in particular had some interesting observations.