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.

Hello All

This is my first post. I am having 2 issues with my Princeton chorus. 1 I get a hum similar to what the original poster is having and 2 the reverb is noisy. I have the spring reverb in my unit. I have already had the chassis and PCB out to replace the volume pots with audio taper pots. when testing with the chassis out the chassis actually vibrated. This is an early black knob  may be a late 80s or early 90s unit. I would like to pull the chassis this weekend and re-touch the solder on c60 and c59, Is there a way to test the caps while I am in there? I re-touched R106 and R107 as I saw a you tube video of someone having a noise problem so I thought I would do some Preventive soldering here..

Any ideas on what to look for on the reverb? I may have strained the cheesy cable that goes to the reverb on the 1st opening of the chassis.

Thank you in advance. This forum is great.