Since there is a ground connection on the interconnects, I don't see how connecting a separate wire as suggested would help. Plus I personally wouldn't do it because of possible electrical consequences that I don't really understand. Better safe than sorry. Good luck finding a solution!
Help with hum
I have a hum coming through both speakers. It is independent of volume control and completely stops when the preamp is disconnected. Disconnecting source from preamp has no effect. I have tried switching cables and tubes from channel to channel but it keeps humming. I have tried all combinations of cheater plugs on both amps and on the preamp but with no improvement. Any advice regarding cause or diagnosis is appreciated. Preamp is Cary SLP-98 and amps are Manley Neoclassic 300b's.
Thanks in advance,
Dave
Thanks in advance,
Dave