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Fender Princeton Reverb Squeal
Posted: Sun Apr 17, 2011 12:37 pm
by rcol1325
I'm working on a late 60's Fender Princeton Reverb, and am getting a loud squeal when I turn up the reverb approximately half way. I have tried tapping, pulling, swapping, and replacing the preamp tubes with no success. I do notice, when I turn the reverb knob to just before the point of squeal, I can tap the caps near the first preamp tube and get some popping. Has anyone had similar issues? I'm kinda stumped. Possibly a bad solder joint?
Re: Fender Princeton Reverb Squeal
Posted: Mon Apr 18, 2011 6:53 am
by Mars Hall
rcol1325 wrote:I can tap the caps near the first preamp tube and get some popping. Has anyone had similar issues? I'm kinda stumped. Possibly a bad solder joint?
The way you describe it does sound like a cold solder joint, couldn't hurt to reflow some connections in that area.
Re: Fender Princeton Reverb Squeal
Posted: Mon Apr 18, 2011 3:58 pm
by rcol1325
Yup, broken solder joint. I retraced my steps, and pulled tubes again. Isolated the problem on the reverb recovery tube. And, finally found that pesky little solder joint which was a ground reference for the cathode resistor on that tube. Should've been more thorough when doing voltage testing, and I would've caught it sooner. Thanks for the response.