Help with ground problem

[badgerEE]

Ok, here is the gear in use: Amps are Carver Silver Seven-T Mono-Blocks, Preamp is Carver C-27, Speakers are Infinity SM-150.
Problem: Fire up the system and huge ground hum.
Steps taken so far: Disconnect all inputs to preamp (CD and TV) and the hum is still there. I ran a ground wire from the ground post on the preamp directly to the power outlet center post, checked for continuity, and get the same thing.
There is no hum when I disconnect the signal cables from the preamp to the power amps (duh?), but I had to try.
the signal cables are not new and I can't vouch for them 100%, could they be the culprit?
Help me oh gods of audio!!

 

[mtrycrafts]

Ok, here is the gear in use: Amps are Carver Silver Seven-T Mono-Blocks, Preamp is Carver C-27, Speakers are Infinity SM-150.
Problem: Fire up the system and huge ground hum.
Steps taken so far: Disconnect all inputs to preamp (CD and TV) and the hum is still there. I ran a ground wire from the ground post on the preamp directly to the power outlet center post, checked for continuity, and get the same thing.
There is no hum when I disconnect the signal cables from the preamp to the power amps (duh?), but I had to try.
the signal cables are not new and I can't vouch for them 100%, could they be the culprit?
Help me oh gods of audio!!

The easiest to check is another interconnect. You should have others hanging around someplace

I am betting on this. Small bet Then try to connect a grnd between the amp and pre and see.

 

[badgerEE]

Update on Ground Problem

Tried new interconnects - No help..
got out the trusty multimeter and checked around. turns out that not all the jacks on rear of pre-amp were grounded. Took the unit to a trusty repair shop ( in Jersey? it actually exists) and he found that a run on a circuit board was burned/lifted and the ground connections weren't getting through. Repaired that and all is well in audio land. There is a bit of hum, but nothing to get upset about.

 

[mtrycrafts]

Tried new interconnects - No help..
got out the trusty multimeter and checked around. turns out that not all the jacks on rear of pre-amp were grounded. Took the unit to a trusty repair shop ( in Jersey? it actually exists) and he found that a run on a circuit board was burned/lifted and the ground connections weren't getting through. Repaired that and all is well in audio land. There is a bit of hum, but nothing to get upset about.

Good that you found the resolution to the problem. I should have mentioned a bad in/out plug.

Do you have a cable TV running to the audio gear? Via a VCR perhaps? That can introduce a ground loop and there is a solution to it as well
All the components grounded? Interconnected with the ground as well?