Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Toxophilite on October 27, 2016, 12:29:32 pm

Title: Homemade deluxe reverb volume problem
Post by: Toxophilite on October 27, 2016, 12:29:32 pm

I have a BF style one channel deluxe reverb with bias vary trem that I built in a hammond AO-43 chassis with the generous help of this forum. It has been a cool little amp
However lately it has started to do a curious thing...which is particularly annoying when practicing quietly in my apartment in the evening.
It dramatically increases in volume. Like somebody is rotating the knob up over a few seconds (I watched the volume knob, no paranormal activity) sometimes it jumps right up. Kind of crazy
I haven't opened it up in a while and the problem happens intermittently


Any idears?

Title: Re: Homemade deluxe reverb volume problem
Post by: sluckey on October 27, 2016, 01:06:28 pm

May be time to open it up. Thump some tubes.

Title: Re: Homemade deluxe reverb volume problem
Post by: P Batty on October 27, 2016, 02:10:53 pm

Bad connection/resistor in NFB circuit?