delkal... Thanks, the speakers are not powered though they are horns thus any hum is very noticeable. Note that the other monoblock is dead quiet.
Hum Super Sleuth Needed
OK guys, not my first rodeo but this one has me scratching my head. I have a pair of Coincident Frankenstein-MkII monoblocks. One is dead quiet, one has a psudo 60Hz hum with the amp hooked to the speaker and no input hooked up. Here is what I have tried thus far:
- Cheater plug on power cord to lift ground (no change) If this had worked I would just get a Hum-X and be done.
- Swapped all three tubes between amps (no change)
So if it's not a ground loop on incoming power and not a ground loop on the RCA input (unhooked) what can it be? Possibly a bad filter inside the amp? Anyone have ideas?