Supratek Owners Thread

Greetings All - 
It appears that the 26-million-plus view, multi-decade "Preamp Deal of the Century" Supratek thread has been removed. I'm not sure why, but suppose there must be a reasonable explanation.
In any case, on that thread I recently asked whether there might be interest in a "Supratek owners thread" and received some interest. 
The purpose of this thread is for Supratek owners to share the details of their system, ask questions, share information about any tube-rolling they have done, and so forth.
I'll kick us off here with a few details about my system -
ancient Linn LP12 with Ittok arm, Dynavector 17D3 cartridge into Cortese LCR phono stage
Power amp is a fully serviced Innersound Electrostatic amplifier
Quad ESL63 speakers (not USA monitors) or JBL 4430 studio monitors
Digital sources are immature and evolving - ancient Fostex CR300 cd player/burner
DacMagic 100 DAC
Nordost Blue Heaven 75ohm interconnect
Due to the fairly long lengths of speaker wire required in the new listening room, speaker wire is Belden 12 gauge wire designed for low-voltage outdoor lighting systems. 
Next steps - dedicated circuit, new power cords, new interconnects, new wires.
Brad is supposed to make great cables but from what I have heard on other forums pay no attention to his promised delivery times as they are mostly make believe.
Well Mick says its not the power/umbilical cord so I am left with the hum. I am looking at hum busters. Any suggestions?
Pack it up and take it to a friends house to eliminate your house and neighborhood interference.
In order to eliminate the hum, I bought the iFi SilentPower - GND Defender - Intelligent Ground Control, IEC Connector Ground from Amazon. I tried it on the preamp and Amp but it did not work. I am thinking again that it is the umbilical cord but Mick does not think so. I am scratching my head here.