Simon. Tabs are not long enough to Bend back to pot but I jumped them
With small wire run and grounded them to back of pot. Still got the hum. Aargh. My multimeter (set at 200ohm reading) reads about 1.0 or 2.0 when I touch the probes. Ground solder point to ground solder point across the wiring reads from 1.0 to 4.0. Seems within reasonable range?? The hum shuts off when the master tone is pushed to either end of its range? Is that a hint to where to go next?? Thanks for any suggestion!!