I'm assuming ElCap is short for "electrolytic capacitor" and not another specific type of cap, or brand.
One of those 2 ElCaps has its anode to ground, the other its cathode to ground. Comparing to chassis ground, the ElCap that has its anode connected to ground reads -12.36V at the cathode, the other reads 12.34V at the anode. At the Zeners I find 12.32V and -12.35V. The resistors by the Zeners read 12.34V and -12.38V on one side and 25.6V -25.6V on the other. All looks normal to my tourist eyes so far.
Going down the line, both opamp ICs are supplied with -12.xV at pin 4, and 12.xV at pin 8. I've reseated them to be sure. No change.
I put the 1OUT and 2OUT pins of both opamps ICs on the oscope and found nothing (with no guitar plugged in and no signal), though I'm new to using this oscope so it could be user error.
Looking for another good place to put my oscope ground probe using my MM, I found that all 5 prongs on the phone jack are grounded (when there's nothing plugged into it).
That surely can't be right, can it?
The phone jack is one of those I believe: https://www.switchcraft.com/Drawings/ra49b_Series_cd.pdf
It's setup like this <see photo>
Thanks for guiding me through this... I'm learning a lot, and it's tons of fun.
One of those 2 ElCaps has its anode to ground, the other its cathode to ground. Comparing to chassis ground, the ElCap that has its anode connected to ground reads -12.36V at the cathode, the other reads 12.34V at the anode. At the Zeners I find 12.32V and -12.35V. The resistors by the Zeners read 12.34V and -12.38V on one side and 25.6V -25.6V on the other. All looks normal to my tourist eyes so far.
Going down the line, both opamp ICs are supplied with -12.xV at pin 4, and 12.xV at pin 8. I've reseated them to be sure. No change.
I put the 1OUT and 2OUT pins of both opamps ICs on the oscope and found nothing (with no guitar plugged in and no signal), though I'm new to using this oscope so it could be user error.
Looking for another good place to put my oscope ground probe using my MM, I found that all 5 prongs on the phone jack are grounded (when there's nothing plugged into it).
That surely can't be right, can it?
The phone jack is one of those I believe: https://www.switchcraft.com/Drawings/ra49b_Series_cd.pdf
It's setup like this <see photo>
Thanks for guiding me through this... I'm learning a lot, and it's tons of fun.