Harry, The fact that you didn’t know how to discharge the capacitors (yes- this is why/how you can get shocked from an unplugged amp!) indicates that you lack the basic knowledge needed to go any further with this diagnosis/repair. IMHO you’re done everything that you could reasonably do yourself. Take the amp to a trusted music store and have them repair or they suggest someone to do the repairs. Its likely you can get it fixed for under $100. Good luck, Ron

Can anyone help me: I have an old fender champ 12 that used to be my dad’s. Until very recently it worked fine but about 4 months ago it completely stopped working and now simply emits a low buzz when plugged into the power. Switching the on/off switch makes no difference and the power light doesn’t come on. I recently dismantled the chassis to see if there were any obvious loose connections and to ceck all the fuses inside, but everything I could see seemed fine. I also gave myself an electric shock doing this, which as I had completely unplugged it I found a little confusing. I’m guessing it’s not an issue with the speaker unit as surely that wouldn’t affect whether the light was turning on/off? Any help/advice on how to fix this, or what might be the problem, would be enormously appreciated! Either reply on here or drop me an email at coath_5@hotmail.com. Many thanks, Harry

If you carefully review the schematic, you’ll see you missed several tubes in your tube listing. The listing should read:

Preamp: 7025 or 12AX7,
Reverb Driver: 12AT7
Reverb Return & Phase Inverter: 6C10 Compactron
Power: 2x 6V6GT

Geno Dunn