KraftyBob
Well-Known Member
I bought a non-working Peavey Valveking 112 (original series) to fix and resell. Got it working but it had a bad hum. Turns out there was a batch of these that had a hum problem due to the signal running too close to the power supply in the PCB. Did the mod to break that connection and run a grounded wire away from the power supply. The amp is very quiet now - much quieter than my DSL40C in fact.
Even though this is a fixed bias amp, Peavey did not install a trim pot and used a resistor to bias it on the cold side. This one was at 15ma so I added a trim pot and biased it to 35ma.
I played it at low to moderate volume to test it and thought not bad, could maybe use a speaker upgrade. Then yesterday I was home alone and decided to put some volume to it. That is where this thing shines! It was super tight, great low end which vibrated the floor and the speaker really came to life. If I wasn’t trying to downsize I would seriously consider keeping it. That and I recently bought a Hot Rod DeVille IV to fix and sell and ended up keeping that (not a good business model when you’re trying to make a few bucks on the side lol).
Even though this is a fixed bias amp, Peavey did not install a trim pot and used a resistor to bias it on the cold side. This one was at 15ma so I added a trim pot and biased it to 35ma.
I played it at low to moderate volume to test it and thought not bad, could maybe use a speaker upgrade. Then yesterday I was home alone and decided to put some volume to it. That is where this thing shines! It was super tight, great low end which vibrated the floor and the speaker really came to life. If I wasn’t trying to downsize I would seriously consider keeping it. That and I recently bought a Hot Rod DeVille IV to fix and sell and ended up keeping that (not a good business model when you’re trying to make a few bucks on the side lol).