I have several Bottlehead C4S boards and was considering using one on the 6LS7 in the GSG. Is this doable and what improvements would be expected. I remember Shannon experimented with a C4S circuit in one of his amps but do not recall any feedback.
On a different note, the GSG is sounding very good right now. I have not received the copper cap rectifiers (they have not been built yet) and am using a GE 6AX5GT. The GE's sound alot better than the original RCA rectifiers that I had, I can definitely live with the GE rectifier. Anyone tried tube rolling the 6AX5's and found a difference in the sound quality?