xtom68

Responses from xtom68

Very Specific Ground Loop Question.
Yes. I have taken the computer completely out of the loop, and same effect. When I start with the amp/pre, there is hum. When I have just preamp>amp there is hum. Maybe I just have two bad preamps. 
Very Specific Ground Loop Question.
Here is even more information. In an effort to see if this had to do with the computer, I reconfigured to go through one of my receivers. Same effect:TT>tube preamp>receiver (ground wire on outlet)=buzzTT>tube preamp>receiver (ground w... 
Very Specific Ground Loop Question.
I tried moving the TT away from the preamp, and no change. I also tried putting the ground wire everyplace on the pre-amp I could see, including chassis, power supply, etc. No change.Interestingly, I discovered something else. I still get ground-l...