Thanks for the suggestion. Yes it has the same 20+db hum while being off, less without the 300B installed.
I have tighten everything and the ground lugs are conducting as expected but the hum is still present. I noticed with it switched off I can still hear music in my speakers even if that specific input is not selected and I can even adjust the volume on the selected input. I though maybe it's something with the selector switch so I bypassed the switch going from the rca jack to the beeQuiet input directly with no result. Even stranger the inputs the are no longer physically connected still pass a low level sound to my speakers.
Furthermore I can hear music with the beePre off if I touch any part of the ground such as the chassis with the positive part of the cable connected to my source.
If all else fails I might have to rebuild it.
I have tighten everything and the ground lugs are conducting as expected but the hum is still present. I noticed with it switched off I can still hear music in my speakers even if that specific input is not selected and I can even adjust the volume on the selected input. I though maybe it's something with the selector switch so I bypassed the switch going from the rca jack to the beeQuiet input directly with no result. Even stranger the inputs the are no longer physically connected still pass a low level sound to my speakers.
Furthermore I can hear music with the beePre off if I touch any part of the ground such as the chassis with the positive part of the cable connected to my source.
If all else fails I might have to rebuild it.
