I'm looking for info or a kit to mod my Mark III Simul-Class so that I can adjust the Bias current and get rid of the grainy sounding power section. Right now I have 2 GT EL34's S-7(V6, V9) and 2 GT 6L6GE (V7,V8)H6.
I did some voltage and bias current checks and this amp is running much to...
