Loud Audible Hum/Noise from C/J Tube Amps


Hello,
Anyone has experienced audible noise using C/J amplifiers: I have the LP70s and MV60SE. Once the preamp is turned on, the noise is too loud that can be heard 20-30 ft away. I was able to cured the problems by using th $49 cents plugs from home depot to bypass the ground loop. Any other suggestions? Is this normal for CJ amps? i have the same problem on both units...
Thanks
anthuan

Showing 1 response by andrewdoan

I wish we have some scientific explaination abt hum/ his/pop from tube pre and SS amp or vise versa. My tube pre gets loud hiss from speakers when mute off. It also pop when volume up and down at my house. I took the same pre/ amp/ ICs to dealer's place, no pop no hiss. Blame it on my eletrical wire ? Very convenient, temporary answer to a permanent problem.