Tube Amp Archive

Yes mhartman, the footswitch jack is isolated from the chassis w/a cliff jack. ToneMerc, I had thought of adding a dedicated trans, but talked myself out of it on the premise that the 5vdc relay power isn't connected to a chassis ground. I'll try that now. Thanks for your help guys.

Hi All, Looking for some help with a Dumble #183 build. The amp is together and working, but there is some unwanted noise coming from the relay circuit. I used the Hoffman relay boards and power supply. which runs off the heaters. The heaters are center tapped w/2 150r resistors per the schematic. T...