I would second the hypothesis that the voltage ramp up causes the hum. I've had a Spectron Musician IIISE in my house for about a week and a half, and it sometimes hums (the unit, not through the speakers)...but it's always been around 5-5:30 in the morning...never in the afternoon or evening. Come to think of it, kind of fits the same scenario with some Blue Circle Noise Hounds I have.
Buzz/hum from Spectron Musician II amplifier.
Cross posted in amp forum: Just purchased the unit from another 'Goner. It makes phenomenal music, but has an electrical buzz/hum upon power-up which comes up slowly and then reaches a steady state after about 3-5 seconds.
No noise through the speakers, thank goodness, but from inside the case itself. It is just loud enough to be barely audible from about 10" away. Incidentally, the amp in my subwoofer is doing the same thing and both are on the same circuit, so I suspect noise coming through the circuit. The seller confirms he had no such problem, which tends to reinforce this conclusion.
I tried to reverse the ground - using the 79 cent 3 prong to 2 prong adaptor. No luck there. Hum was also present when plugging into through a Panamax power condition on the same electrical circuit. I am out of ideas. Anyone?
No noise through the speakers, thank goodness, but from inside the case itself. It is just loud enough to be barely audible from about 10" away. Incidentally, the amp in my subwoofer is doing the same thing and both are on the same circuit, so I suspect noise coming through the circuit. The seller confirms he had no such problem, which tends to reinforce this conclusion.
I tried to reverse the ground - using the 79 cent 3 prong to 2 prong adaptor. No luck there. Hum was also present when plugging into through a Panamax power condition on the same electrical circuit. I am out of ideas. Anyone?