Fender Pro Overhaul

I was lucky enough to come into a completely stock 1964 Fender Pro Amp. This has the desirable vintage AB763 circuit - basically a Vibroverb without reverb. The amp had become quite noisey and so I decided to do an overhaul. I replaced all the old electrolytic capacitors, cleaned all of the switches and sockets, and discovered that a couple of ceramic capacitors had become fully microphonic. The amp is back in service in the studio and records very well.

The completely untouched (except for a 3-prong cable) AB763 circuit

My homemade dummy load with switchable 4ohm and 8ohm impedances.