Dual boost/cathode boost?

[Pott]

I've been thinking a lot about that amp I constantly want (dual EL84, pentode/triode switch, 3 gain stages (one switchable) or dual boosts)

Anyway I figured I'd have two gain controls, for stage 1 and 2, each voiced differently. One brighter, the other bassier/thicker.

So if you could have a cathode boost (switch to a lower value resistor) on each, you could almost have a different channel. Want more gain and less mud, kick in the boost on the bright gain stage for more cut.
Want a thicker, bluesier sound, kick in the bassier one.

Is there anything in the laws of physics or valve amps (which from what I gather often aren't even the same haha) which would prevent this?

[phsyconoodler]

Actually adding a boost by switching a cap in and out across the volume control would work better.Try a .002uf for a boost and a slightly better treble and a .05uf for a thick boost.
They go where a bright cap would normally go.Of course they would only work when the volume was below 8.
The cathode resistor/cap route works too,but it's not as much of a difference.

[mooreamps]

So if you could have a cathode boost (switch to a lower value resistor) on each, you could almost have a different channel. Want more gain and less mud, kick in the boost on the bright gain stage for more cut.
Want a thicker, bluesier sound, kick in the bassier one.

Is there anything in the laws of physics or valve amps (which from what I gather often aren't even the same haha) which would prevent this?

You can gain switch the cathode. I do. The effect is sudtle, unless you switch the plate resistor at the same time..

-g

[Pott]

Ah ok so it'd be more subtle than it seems... Mhmm...


The goal is to have a clean sound, then switch in an extra gain stage, then have the choice of the two boosts (or both) for lead or all out metal.

So yes essentially that'd be three footswitches. But it leaves out A LOT of tones, and keeps the amp essentially pretty simple as far as signal path goes.