On Wednesday, July 15, 2020 at 10:53:29 PM UTC-7, wrote:
Hello, I have a 1988 Fender Princeton Chorus amp, I believe this was the first year model.

I have a faint chorus sound/FX in both the rate & the depth controls.

I replaced the MN 3007 & MN 3001 chips today, but still no real change. The chorus FX is there, but really faint.

Both speakers are working, both sides of the amp seem to be working and the amp is totally stock. Nobody
has changed anything except for what I did today.

Can you help me ? Maybe tell me what else to change ?

I cant read a schematic at all, so please if you could be so kind, please explain where to find the parts that
you might suggest that I try changing.

Stay safe, Charles

NOTE: I live at least 200 miles from the nearest repair station so I'd really like to fix this problem myself with your help of course

My 1988 Fender Princeton Chorus Model PR82 Made In USA is completely stock, a totally virgin amp. The IC's MN 3101 and MN 3007 are stock parts that came out of this amp. I replaced them with new ones yesterday, but no change, the Chorus is still having problems. The pilot light comes on, and both the Rate & Depth controls seem to be working, but the FX is very very weak.

BTW...this is not a Princeton that uses DSP...the amps that featured DSp effects came after the PR82 models and don't sound near as good.

Stay Safe, Charles