When is the last time that you inspected your ground connection between TT and preamp ? Wires from cartridge to headshell ? Interconnects from TT to preamp ?
If all of those are good, try checking the AC orientation of all of your components to make sure that they are correct. Here's a link to a previous thread. This can make a VERY big difference, especially on such low level signals like phono systems. I ran into this when i installed a TT with a "two pronged" preamp that lacked AC polarity on the plug. Simply reversing the AC plug got rid of it.
http://forum.audiogon.com/cgi-bin/fr.pl?htech&1014011751&openfrom&17&4#17
If all of that fails, try pulling your preamp apart and make sure that all internal screws holding the board down are tight. I would suggest backing them all out a few turns and then snugging them down rather than just snugging them down. This guarantees a fresh and clean "metal to metal" contact and may reduce / cure your hum based problem. Hope this helps... Sean
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If all of those are good, try checking the AC orientation of all of your components to make sure that they are correct. Here's a link to a previous thread. This can make a VERY big difference, especially on such low level signals like phono systems. I ran into this when i installed a TT with a "two pronged" preamp that lacked AC polarity on the plug. Simply reversing the AC plug got rid of it.
http://forum.audiogon.com/cgi-bin/fr.pl?htech&1014011751&openfrom&17&4#17
If all of that fails, try pulling your preamp apart and make sure that all internal screws holding the board down are tight. I would suggest backing them all out a few turns and then snugging them down rather than just snugging them down. This guarantees a fresh and clean "metal to metal" contact and may reduce / cure your hum based problem. Hope this helps... Sean
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