As requested, some pictures:
Before... (old bolster upholstery.)
The lower motherboard in the master section looks like it had some bad dental work done by the previous owner(s) but it beeped out fine!
in progress...
Some of the mic pres have this type of mod. Jim Williams, is this similar to what you've described?
Family portrait :-) JH 110 C from 1984 in decent shape! It will be the next project...
I re-capped re-socketed and re-chipped the Master and Monitor Module- with the exception of the tantalums. The distortion is still in the 2Mix output, but not when patched from Stereo Out to Aux in. Could it be the tantalum caps? The master fader? Or perhaps one of the J111s?
Jim, I'm moments away from sending my other Master module to you to work your magic, and then I might have both flavors available...
Thanks to all for your interest, advice and encouragement!
Best,
Ryebot