First I would try disconnecting the jfet Q3. Either of the legs connected to R42.
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Fender Rumble 500 Power Supply Issue
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I don’t recall their pot details. On larger dia pots that have the mechanical terminals riveted to the resistance wafer, I have had to generally tap the rivet between a suitable center punch pin mounted in a vice and further flatten the other side of the terminal revit to restore solid mounting and restoring conductivity.Logic is an organized way of going wrong with confidence
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Q3 shorts R42 but brings the signal line much closer to ground, so may be acting as a mute.Originally posted by EnzoI have a sign in my shop that says, "Never think up reasons not to check something."
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Originally posted by Bryan View Post... I get nothing at Pin 8 on U3
This is the power supply pin U3.
Originally posted by Bryan View PostIs there a reason I only get signal on one side of C18? I get signal between R37 and C18 but not C18 and R43.
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I'm using 100 hz. That's what it says in the schematic.
Anyway, I'm good on the Overdrive circuit now too. All is working. My bad resoldering on U4 pin 11.
I still get the balance shift on the rails when I plug in the fan. I get -12v instead of -10v. Maybe it is a bad zener D26. But it is now making much better sounds than when it arrived.
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