Thanks g1. More noteworthy info: the left volume POT (input 1) bleeds audio when the amp is turned all the way down. I replaced all pots with Fender originals about 6 years ago. It worked fine then.

-VGuitarist.

Had a minute, so I cross connected another Fender amp with it (pre-amp to power amp). Definitely the pre-amp. Sounds reasonably good from the second amp pre-amp out --> bad amp power amp in. The opposite direction produces the same shrill sound on the second amp. Any thoughts before I begin component level troubleshooting? I found the schematic.

Thx

-VGuitarist

Makes sense. I'll post the results later today.

-VGuitarist

Greetings Everyone,

I have an old Fender Deluxe 112 Plus solid state amp (type: PR291, Serial: LO-674886). Been sitting in the garage for a few years. Want to give it to my son, a 9 year old aspiring rock and roll guitarist. It used to sound good, but now the sound is mostly midrange/treble. I do hear some low end if I crank the bass knob all the way up. The shrill sound goes to the bone!

Don't want to toss the amp and could use some help locating the root cause. I already inspected the circuit board and did not see any burnt components. I also re-soldered every connection...no help. I'm thinking the next move is verifying capacitor values (non are physically expanded or leaking). Any other advice? I'm an engineer, so electronic-speak is not a problem.

Does anyone have a schematic for the amp?

Thanks in advance!

VGuitarist