Hum like you're getting now is caused by different ground potentials. In other words one component path to ground has a little bit more resistance than another. Usually simply plugging everything into the same outlet (power conditioner) will do. But don't knock yourself out, not when you already have a fix. And you can forget about the fire, death and destruction that will supposedly happen if you keep using the cheater plug. Or you can disregard this post, as it comes from a guy who has already been electrocuted to death by soldering on a lethal voltage tube amp.
Question about hum from speakers
I know there's at least one amp engineer here... I'd like some help. I bought a used solid-state amp from ebay; the ad read "
McCORMACK POWER DRIVE DNA-.5 Deluxe REV B POWER AMPLIFIER - EXCELLENT CONDITION!"
Well, I swapped it in, replacing a Dynaco Stereo 120, and there's a hum from both speakers. I have to believe that the seller was well aware of the hum. What I'm wondering is, is the hum a result of some electronic component(s) in the amp failing (or having failed), such that it's salvageable by replacing the bad component(s)? Or would that be hoping too much?
Well, I swapped it in, replacing a Dynaco Stereo 120, and there's a hum from both speakers. I have to believe that the seller was well aware of the hum. What I'm wondering is, is the hum a result of some electronic component(s) in the amp failing (or having failed), such that it's salvageable by replacing the bad component(s)? Or would that be hoping too much?