Eliminate system hum

I have found several brands of EF86 tubes are very sensitive to RF noise. Make sure its not any of the tubes by moving your hand close to them,(do not touch them) if the noise level changes then try another tube.

If you have a Tube Cage, try taking it off or if your not using it putting it on.

You dont say if your using any power conditioning, if you are, try lifting the ground on the amp by using a cheater plug. This might indicate a ground loop.

Try a better power cord on your amp. Perhaps one with better shielding.

I have used the Blue Circle Noise Hound with EXCELLENT results. Just plug it in to any outlet close to the outlets that you use for your tv.

PS Audio makes a humbuster. No personal experience though.

A dedicated circuit is the best way to go. The Nation Elec.Code (NEC) has changed it's grounding requirements over the years. So it depends when you house was built or updated what kind of grounding you have. Also different States ,Counties and Cities have varying requirements. What you need is a dedicated ground and neutral to your System. The neutral is a current carring ground. It will transfer noise. Also if your electrical panel has a bonded ground the neutral and ground are connected at that point (carries noise). You need to "float" your ground to your music system. Talk to your electrician when installing a dedicated circuit about isolating you neutral and mechanical ground.

NEVER use a cheater plug!!!!

That is extremely dangerous and does not provide a way for parasitic currents to ground. Believe me you do not want to be the path to ground!!!

The answer is to ground all equipment in the system to a common potential i.e. a single circuit or circuits that use a common ground.

05-31-06: Elescher
If your Cable TV is run through your system, try disconnecting all cabeling between the two and see what happens

In my system the hum is clearly caused by the cable tv, disconnect the cable and hum goes away. Unfortunately I live in an area where there is NO TV without cable. I live in a gorge in the Santa Cruz mountains and am surrounded by trees so I can't use sattelite TV either.

Any ideas on how to get rid of the hum caused by cable tv