I'm new and registered to post a question on an issue I've had with my 1999 Fender Princeton Chorus DSP for several years now.  I'm getting back to playing electric and this amp has what seems like some sort of low-frequency (but undesirable) honk/buzz/fart/resonance/feedback when playing low E/G area with mid volume and gain around 5 (Electra/Westone strat copy with JBJr bridge bucker).  It seems like it's also trying to do it in the clean channel with a good bit of volume, but it doesn't go into a resonant/feedback mode like it does with some gain. Hard to describe the noise, but it goes from a nice rich ringing E or G to a braaaaaaaaaaaaaaaaaap. If I don't change to another note, it will continue to self-sustain.

I read here that SS Princetons had filter cap issues like solder and vibration (glue) issues and I opened mine up to compare.  Caps seem solidly mounted with a large bugger of glue between them - should I squeeze some additional hot-glue between them or is this likely a different problem? Speakers (2x10 stock Fenders) look fine and when this happens both speakers seem to be doing it.

An interesting observation -  As there was some glue in there spacing the caps, I put a strong rubber band around the caps to see if it would make a difference (perhaps some vibration issue and resonance might change).  The same noise was at same freqs still, but I also heard another similar effect around B blues/power chords and the amp darkened/lost some gain. Took the rubber band off and it went back to brighter without the B-ish resonance. Must be an electrolytic cap reaction to slight pressure?

I like the amp, but this noise must go away!  Any thoughts?