Grounding problems-- Help!

Do you have cable TV in your system too? That can often cause a ground loop through the coax cable. Try getting some "cheater plugs", one for each three-prong plug in the system, and use them in various combinations. Always have at least one component (preferably the amp) grounded though, for safety. This worked for me before--I used a cheater on my preamp and left my amp grounded and that killed the hum. Good quality power conditioning may help a lot, too.

The best way to solve a ground problem is to work backwards. Disconnect the poweramp from the preamp is see if there is hum. If not, then the problem is upstream. If so then the ML's may need to have their plugs reversed. Then connect the preamp without any inputs physically connected. The inputs must be disconnected because their grounds are active even if they are not selected. When you finally get a hum, try a cheater and see if it helps. If it does not help, then trim the edges off of the bigger (ground) plug so that you will be able to reverse it.

I recently moved into a new apartment and found that my pwr amp gave off a hum - when the tv set was connected to the fitted aerial socket in my wall! Everytime I wanted to watch terrestrial tv I had to turn off my pwr amp. Try unplugging you tv from its aerial connection. If this answers your problem, e mail me for more info. Nick Bennett Zürich