Preamp stage help please.

[Stratz]

You can't let grids float.

Thanks very much for pointing me in the right direction Enzo.

[Gingertube]

Stratz,
Not sure how much "re-wiring" you might contemplate. But if you want 2 channels with different gain structure then might I suggest a bit of thinking outside the box and replace the 6AV6 triode in the 7 pin socket with a 6AU6 pentode.
I have "re-purposed" a 7 pin 6AV6 socket in a previous conversion but in that case I used the 6AU6 as a tremelo oscillator (like some old Danelectro).
Cheers,
Ian

[Stratz]

Thanks Ian. I have quite a few NOS 6AU6's laying around.