Ok, now I can see the pictures in post #14.  The ones in post #4 and #5 just open a blank page for me.

To drop the 58V down to the 12V zener (46V drop), that 1K5 has to run at 1.4W, so the 1W on the schematic is wrong.  My guess is even a 2W there would run pretty hot and maybe cause some browning of the board, so they just went with the 5W.

Quote from: Tassieviking on November 24, 2023, 01:53:47 AMIt is strange that you are worried about that power resistor that is also 1k5 that is dropping all that powder, there are only 2x 1k5 resistors on that schematic that I can see and they should be 1 watt.

I may have missed it, but I don't think he mentioned a value for the cement resistor?
There are several 7 watt resistors in the circuit and I assumed he was speaking of one of those.

No, he is talking about the SS version.
Look how the footswitch jack connects to a point marked 'X'.
That X goes to the relay he mentioned.

Is this the later tube version (TC) or is it solid-state?
I have a feeling you may be here because it is solid-state. 

Attached is the SS version schematic

A zero ohm reading between components would confirm a connection without flipping the board.

Yes, the 74HC132 is backward compatible for 74132 usage.  The DV is just a brand prefix I believe.
The audio transformer might have been used for mic inputs, as 500 Z impedance is probably close enough to the standard 600 ohm.
Here's one in use for matching PC sound card out to PA mixer mic input:
https://sound-au.com/project133.htm

Yes, a short would have probably created some heat somewhere and maybe even fuse blowing.
Glad to hear you got it working.

Is B-C junction of Q9 giving proper reading on diode check?  It seems like Q9 might be open.

If nothing is shorted on the (-) side, then something must be open on the (+) side.
You will need more precise measurements across components (one probe at each end) rather than to ground.
What is voltage across R198? R209,R210?
B to E of Q9,Q12,Q13?

A few things you haven't mentioned checking are Q9, D17, D20

You have pretty much -42V at both emitter and collector of Q20 and Q21 (and Q19)?
That would seem like a short.

What are e,b,c DC voltages for Q12 and Q13?

Does the schematic in the first post exactly match your unit?
From what I can see, there are 3 basic versions.
The last IC connects to a transistor which will be either Q4,Q5, or Q12.  Which is it in your unit?

The 2 lugs on the back of the pot are a switch.  If it is measuring like that it must be bad.
You can see it (switch) was wired in series with the fuse in your other thread here:
https://www.ssguitar.com/index.php?msg=41327

It should be pointed out that you may find voltage regulator circuits that use regular transistors as the pass transistor.
This is seen in older equipment from when the VR IC's were not yet available (ex. Yamaha G50-112II +/-15V supplies).