Ok, I see a jumper in the R90 ABOVE board, while VR6 is soldered to what I believe are the Dynamike wires - so that means that the Dynamike pot is wired wrong - or as another has stated earlier, repurposed for another use.
[ATTACH=full]62219[/ATTACH]
But does not explain the "sudden increase" when the pot is turned from down all the way to just off it's stop.
So that then tells me the pot wiper that is supposed to make it variable - has an open spot - not from the composition - it shows 10K across the fixed portion but the spot can be from a "detent" that shows up from lack of turning and use - so the control just has to be used a bit more to see if the indentation formed from being left there in one spot on the composition - can be glossed or burnished over from the carbon composition left on the surface that the wiper can use - in hopes it can transfer some carbon back to the detent.
You can clean the pot and take care of a lot of the "scratchy" effects, but a type of varnish that forms from lack of use, done by the way it was stored and then pulled out and back into service - the composition is old, and many of today's cleaners are way too aggressive in cleaning it off - they can remove the carbon in the composition too.
So you have to remeasure the pot via the wiper arm and then review what the pot is / was rewired for and work accordingly. It simply may be from resoldering the pot onto the wrong pads or the wiper pad is transposed to another pad.
Thanks for and to [USER=41978]@TM86[/USER] for the help!
