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Original Message
re: still trying to track down a hum...
Posted by Tre' on September 19, 2012 at 11:01:54:
Take a pair of RCA interconnect cables and cut one end off of each.
Solder the wire end to the circuit at the 12by7. Positive to the grid stop resistor (10K), top of the 1meg resistor, and ground (shield) to the same ground point of the grid resistor (1meg).
Do both channels. Disconnect the in-chassis input cable.
Connect the other ends to your preamp. Make sure nothing is grounded. If any of your equipment has 3 prong plugs, use a cheater adapter so nothing is earth grounded.
Tre'