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I’ll measure the pots in detail in a bit. Is there an easy/temp way to bypass the tone stack? Can I just jumper around it or would that be bad?
Is it possible that 100k ohms resistor bare wire (on the side where your #2 is) is touching the bare wire of the .033 cap at the other side of the cap where #5 is? That would ground that whole thing!
Ralf
That's bad news... After all the trouble of desoldering the bunch of parts you can't even open that one as it looks since the bottom of the V2 pot is so close to it.
I have no idea how they are connected to each other.
V1 is that one with the red cross, or?
How about to take it out (lots of work already) and wash it completely with Naphta inside before you apply fresh Deoxid? Maybe that saves it from disassembly?
Ralf
That I don't understand. Isn't the bare thick wire at the 1 o'clock position in my picture above going from the middle of the log (front vol) pot (with the red cross) up to the 47pF and .01 capacitors on the PCB (the green and square red caps)? That bare wire comes from the middle of the lin. (back vol.) pot ??? The lin. pot only goes to a .01 cap in the schematic as far as I see.Nope - Vol-1 is the one closest to the panel.
A "Stackpole Electronics, Inc" didn't exist in 1970 (jut to be correct...). The pots were most probably in the Electronics division of the Stackpole Carbon Company in St.Marys, PA or in 1970 already under the Stackpole Components Company in Farmville, VA and/or Raleigh, NC. Hard to say as I didn't find any vintage components catalogs from that time. The new SEI from the 90ies has nothing to do with those vintage parts anymore, unfortunatelly.
Ralf
Oscilloscope time! This is all just signal trace.
Question - is it normal for the voltage to drop so much after the tone controls?
O.k., all clear now, I see and understand. I mixed that up obviously.See those two ceramic disk caps going to the third turret from the left on the board? Those are the .001 caps between the bass and vol-1 pots (both audio).
You should be getting that replacement pot in the mail today or tomorrow. You'll be golden then.