Tube Amp Archive

Thank you to everyone who was kind enough to reply.

I have an old amp that still passes too much bass, even when the bass knob is on zero. The first half of the input 12ax7 uses the common 1.5k/25uf decoupling stage. (I could reduce the cap to 10uf or 4.7uf). Then there is a .02 coupling cap before the tone stack. (I could reduce this to .01) The sec...

I have a Black Face Tremolux. To raise the preamp and PI plate voltages, I am going to change the 10K resistors in the filter cap can to 1K and 4.7K (like the Pro, Super etc.) Do I need to change the filer capacitors? They are all presently 16/450 (the correct value for the Tremolux) The schematics ...

How important, in terms of tone, are the .1 capacitors that are situated between the phase inverter tube and the power tubes, in blackface fender amps?