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I have a new tube preamp and push pull power amp. made by a small company, where the attention to detail on the build end is sometimes not all that it should be. The only buzz or hum i can hear through the speakers is when i touch the balance and volume control on the preamp. Otherwise, it is dead quiet. Now get this, if i stand on a rubber matt the buzz goes down a lot!I have a filtered power bar made by Blue Circle. It is earth-grounded. All of the components in my system hook directly into this power bar,using schuko plugs with grounding contacts. I have non-balanced interconnects.
When i play my SS Blue Circle integrated, there are no hums, not even when I hook up headphone amp into the tape loop.
Follow Ups:
Try placing a ground washer on the body of the volume and balance pot (between the chassis and the pot) and grounding it.
CJ does this on some of their models.
It is a groundloop. He only grounds through the RCAs. My power plugs are all grounded. I took out the earth ground and the buzz went away. I don't like the way he did it, though.
Are the controls grounded inside the amp? That is, mounted to a metal panel. If they are insulated from ground, perhaps you could add grounding wires to the case of each.
Frihed
heres the thing..You no doubt have a torriod power transformer in your preamp correct? I have this same problem with my marantz 7c copy as of late with a toridal after its on a while and I have been using a balanced power unit with great results..I know its a shame to have to do that but this unit helps it tremendously..
The torriods are not shielded like the EI transformers are and the capacitance from your body is reacting with the magnetic field produced by the transformer and its causing the buzz..Somtimes turning the plug around cures it but you no doubt have a polarized or grounded recepticle.
Its not a bid deal but if you put shielding on your power transformer that will help a lot.
He makes and winds his own. It doesn't look like one of the oval shaped doughnut transformers. It looks more like an output transformer, only smaller.I think quite possibly the controls aren't grounded to the cabinet. He forgets to do stuff like that.
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