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This is probably old hat, but just wondering, in order to get more preamp crunch out of a 800/2204 Marshall preamp would:
a) changing V2a's plate resistor to an Engl inspired 470K work well?
b) swapping the CF for a normal triode circuit open up another opportunity to clip the "bottom" half of the waveform due to the even number of stages? It seems there is a surplus of gain/enough to drive the power amp stage. They often get unusable anyways above 7 on the MV.
and) adding a another 10K r/20uF node on the B+ to lower V1a's voltage (only) to get that revered sound that many love that preceded the switch to higher B+ power transformers. Keeping the 100k plate resistor and yet getting a browned down 70-100 volts would be cool.
or) what sort of pot would work for safely dialing down internally ONLY the preamp voltages all at once? Say a 100K at x watts. We're not after touch responsiveness here, just molten tones.
a) changing V2a's plate resistor to an Engl inspired 470K work well?
b) swapping the CF for a normal triode circuit open up another opportunity to clip the "bottom" half of the waveform due to the even number of stages? It seems there is a surplus of gain/enough to drive the power amp stage. They often get unusable anyways above 7 on the MV.
and) adding a another 10K r/20uF node on the B+ to lower V1a's voltage (only) to get that revered sound that many love that preceded the switch to higher B+ power transformers. Keeping the 100k plate resistor and yet getting a browned down 70-100 volts would be cool.
or) what sort of pot would work for safely dialing down internally ONLY the preamp voltages all at once? Say a 100K at x watts. We're not after touch responsiveness here, just molten tones.