Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Underwood on December 05, 2011, 05:32:11 pm

Title: 6G6B Bassman cutting outwith treble on 10
Post by: Underwood on December 05, 2011, 05:32:11 pm

  Anyone here of this? Everything works and sounds great otherwise,but I just turned the treble up to ten while the Volume was on 7 or 8 and it lost volume and started cutting out. Turned the treble down and it was fine. I did remove a .02 cap right before the phase inverter on the schematic that was recommended for better tone for guitar.  MAybe that has something to do with it?

Title: Re: 6G6B Bassman cutting outwith treble on 10
Post by: phsyconoodler on December 05, 2011, 05:40:48 pm

What .02 cap are you talking about?the one across the plate resistor of V2? Hey Tubenit,pay attention to this one!

that would not do what you are describing I should think,but a bad treble pot will.An oscillation will cause this at certain frequencies too.do you have grid stopper resistors on the power tubes?

Title: Re: 6G6B Bassman cutting outwith treble on 10
Post by: sluckey on December 05, 2011, 05:59:39 pm

What he said. Clean or replace the treble pot. I don't see any .02µF cap in that amp.