Here's an update:
After having a number of other audionuts over to listen, they all tell me that they have more noise in their rigs than I do, and that "Your hum is nothing". Well, I guess we all have different levels of tolerance. Perhaps I should just live with it.
FWIW, I ran a grounding wire from preamp to amp, and it didn't change a thing. I have heard intermittent radio signal from one speaker, when placing my ear next to the tweeter, but it disappears most of the time, and can't be heard from even a couple of feet away. Other than transforming my house into a giant copper encrusted Faraday cage, I don't have any ideas worth pursuing. Thanks to all,
Spencer
After having a number of other audionuts over to listen, they all tell me that they have more noise in their rigs than I do, and that "Your hum is nothing". Well, I guess we all have different levels of tolerance. Perhaps I should just live with it.
FWIW, I ran a grounding wire from preamp to amp, and it didn't change a thing. I have heard intermittent radio signal from one speaker, when placing my ear next to the tweeter, but it disappears most of the time, and can't be heard from even a couple of feet away. Other than transforming my house into a giant copper encrusted Faraday cage, I don't have any ideas worth pursuing. Thanks to all,
Spencer