Fender PA100 head

PA100 with 4 channels and some lush reverb. Still running on four old RCA 6L6GCs. A couple of the 70s preamp tubes had to be replaced though.

Fender PA100 chassis

The amp put out no signal at all.  V3 12AT7 was not working, all the flash material was white — the glass was cracked somewhere. Also the V3 470 ohm cathode resistor was burnt to a crisp. Replaced both and the amp worked again. Thought I was done but then I realized the reverb was kind of weak. But it was questionable. It worked ok but seemed a little lacking compared to other Fenders. Getting into it more, it ended up being that the reverb transformer was damaged too. With a new reverb transformer clipped in it was quite a difference and the reverb sounded very nice.  



Fender PA100 schematic. Cool amp with four identical channels. You can bridge them together for a more aggressive sound if you desire.