Tube Amp Archive

I usually have pretty quiet heaters but on a Normal channel 6G6B Bassman build with a different power supply vendor I was having a lot of heater noise. Don't know if it is significant but transformer itself is a talker and has a lot of mechanical noise...even with no load...so... I "de-elevated" my ...

Two things that I have done on fender type circuit: 1. "Dark Switch" 680pf or so from V1 input grid pin to ground. (I put mine on a switch). 2. Simple Low pass filter (location and component values depends on which circuit you built). You can tune the filter to pass the frequencies that you want. Bo...