Got feedback from Parasound. Pretty Interesting...
When I stated that hum was not audible until I had dial at 47 out of 80 possible steps the technician stated that such was not outside of the product's acceptable limits. He stated that a high gain device such as a phono preamp was very susceptible to picking up hum, and that the wall wart plugs (I've got 4 on a surge suppressor/line conditioner strip on separate breaker from preamp) may induce the hum, the cartridge, the speaker being 3 feet from preamp/turntable/etc. all may be culprits and that there's no easy answer here.
GREAT... I'm going to buy a cheapo shure or some other cartridge and put it in to see if hum is lessened, otherwise I may hear some light hum in the quiet passages of some LPs I play loudly, like Firebird or some organ pieces.