The sound is very good at low volume, best I've gotten yet but I'm looking on a couple tweaks to fine tune it.
As the PPIMV is down low the PI tube is getting slammed pretty hard so I'm thinking of trying 470K grid stoppers on the PI socket to help smooth out the gain a touch. Would I use two grid stoppers on both pin 2 & 7? or just one side?
I'm also thinking of reducing the PI input cap from 0.022 to either 0.01, 0.0047 or 0.0022 to help with the gain smoothing also, how would these values change the tone?
The other changes I've made from the stock circuit are:
470k mixers
5uf v1 cathod cap
and PI coupling caps reduced to 0.047uf
Cheers!