Help me voice my overdrive please!

[noworrybeefcurry]

Hey all, I am new to this forum and i could really use some help.

I have been struggling to voice the OD on my first build for some time now. The amp is a non NFB, fixed bias, 6V6 type. The clean side is a fender AB763 circuit with some mods.

-added mid boost
-three way bright
-increased mid pot (100k instead of 25k)

The gain is cascaded over two more triodes, each with 220k/3.3k resistors, 4.7uf and 1uf bypass caps, and a post OD tone stack (330pf, 47k, .047uf, .1 uf, 250k, 500k, 25k)

The clean is nice, but the drive is still.......ok. It has a bit a fizzyness that i cant get rid off. Could anyone lend some insight as far as how i could get a much more aggressive drive that i can still smooth out, and id like a much more saturated drive aswell.

-Thanks

[bcook]

I think I know where you want to go with this: Separate the bass and mid pot grounds if you haven't already. Rebuild your OD like a 70's style with a 220k/33k OD entrance and put 250pf snubbers on each OD stage if needed. Both grid resistors should be 47k or 56k.

[noworrybeefcurry]

thanks alot bro, I added the resistors that you suggested and It made a world of difference. The drive is a little brighter and more touch sensitive. But I was unclear about your suggestion to separate the mid and bass grounds. How would I go about that and what effect would it have.

[bcook]

Sorry, wire up the tone stack using the Dumble wiring rather than the Fender wiring.

[noworrybeefcurry]

should i wire the post OD stack like that as well as the preamp stack?

[bcook]

The only way to know if you like it is to try it. I would recommend making it a non-HRM, 70's style. That'll get you in the neighborhood of the deluxe-on-10, if that's what you're after.

[noworrybeefcurry]

thanks for the advice, ill let you know how it turns out.