Tube Amp Archive

I had a 150K on hand and installed it an was able to get the bias down to 70% max diss for 6V6 tubes.. Thanks for your assistance..

From the wiper to one end of the 47K resistor I get 0 to 20K ohms. So this must be a 20K pot . Is there a pot you would suggest using? Would a 50K pot be OK in this circuit?

Hello maybe my first post here. Been lurking a long time. I have an Express "Francesca" clone here on the bench exhibiting bias adjustment that seems abnormal. It has the 220K bias V dropping resistor and an unknown larger black bias pot. The amp is currently running 6V6 tubes and I can only adjust ...