I still have yet to track down my left channel hum. It does sound higher than 60Hz, so it might be 120Hz. How is your background noise? At full volume, with no input signal, running through a 100wpc ss amp into 92 dB/W/m open baffle speakers, I'm getting some noise. It's not too bad, but it is there. I need to switch preamps and see if it is the amp itself. Now that I know it works, I'm going to go back and cut some long leads and dress up the wire path and solder joints. I hope this helps.I do have a problem that I cannot track down. I have continuity between signal ground and the top chassis. I have no idea why or even if this is a problem, but the two should be isolated. I cannot see anything that would make contact between the two. The RCA jacks are the obvious place to start, but the threads were heavily wrapprd in teflon tape before inserting. I did install a safety star ground, which is connected to the top plate, to electrical earth for the Txs and choke cases. This is the only possible place it could come from, but the cases should be isolated from the inner windings. Is this something to be concerned about?......Colin
PS. I still have not dropped the heater's voltage, so I won't tell if you don't.
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