Hello all

  I have a couple of issues with my princeton chorus.

1. a noisy spring reverb circuit.  The noise is acceptable until ~ 5 on the reverb control and gets really bad from there.  I have replaced the cable and cleaned the connections but still noisy even with the reverb disconnected. when I had the amp apart last I noticed that when i place my hand over the area where the reverb cables are soldered into the amp, I get more noise.  I took a look at the reverb unit and used deoxit to clean all of the internal connections, the unit seems good. Is there something else I should look at?

2. Moderate hum all of the time. I have replaced all of the electrolytic caps in the amp and still get some hum. I noticed that with the chassis out of the cabinet the transformer vibrates a little. I have used cardboard shims where the transformer is attached to the chassis and it has helped a little but the hum is still there. Are these amps ever completely hum free?

Any suggestions would be helpful. Thank you.