Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: RAJPE on July 31, 2015, 12:24:34 pm

Title: Fender Switching Problem
Post by: RAJPE on July 31, 2015, 12:24:34 pm

I have a Hot Rod De Ville 212 which switches on its own for a few seconds from the clean channel to the dirty channel.  I checked the 16 V power supply and was +/- 16.8 volts.  The 330 ohm resistors get hot but not extremely so.  Any suggestions on what else to check?

Title: Re: Fender Switching Problem
Post by: sluckey on July 31, 2015, 12:36:16 pm

Does the LED color change also?

The problem could be almost anything between the foot switch and the relays. Lot of circuitry for a poor solder connection to hide. Maybe even a bad IC, transistor, diode, cap, etc.