Bah Hum Bug


I am having an issue with hum.Hum is only apparent in very quiet passages while listening to lps or when unit is in idle mode.Unit is Dead quiet..no hum in cd mode of operation.

I am running a Fosgate Signature Phono amp,Thorens Td124 with Ortofon Silver Meister Cart,Wright AU-1000 linestage, 2A3 SET power amp into Klipsch Heresy speakers.

When ground is is attached from TT to Phono amp the hum is intolerable so I run the TT with no ground to Phono amp.

I have tried cheater plugs and that has made no difference.

When volume is turned up say past 1 oclock in either the Wright or the power amp the hum is very noticable. Is this indicative of the high efficiency of the Heresys and 2A3 tubes? or is there some other thing going on here?

Please help.Thanks.
fromunda
so annoying. the fact that your system is dead quiet with the CD input seems to eliminate the pre and the power as a source of the hum. so it's the TT or the phono - which are both way more sensitive than any other piece of gear. i had a TT pickup mobile phone data signals over the system if my iPhone was to close to it.

getting rid of hum is a process of elimination. so i'd double check the gain/load setting on the phono. and if you've got other equipment nearby that's not associated with music playback i'd turn all of that off to see if that resolves the problem then start plugging in one by one to double check. cable boxes are prime offenders.
I have had similar problems and it was the cable that connected the arm to the phono preamp. However, I can easily get noise if I raise the gain too much. I mean more gain than it would need to be very loud. So, I agree with those who suggest cable problems. I use a very low output moving coil, and perhaps a "louder" cartridge would be worth a try. I use Kimber Silver Streak between my Denon 100th anniversary cartridge and Parasound JC-3. Pre amp is Audio Research LS 17. I need very little gain for high volume, and I am frankly surprised by how quiet it is. Good luck, you may need to find a helpful shop.