Thanks for your reply. Sorry for my ignorance but what is an "external SUT"? Also not quite clear on a "star earth". I do notice a little more noise coming from the right speaker. And it seems less loud when I don't have the TT ground wire connected. I played with the fixed and floating ground and also found it made no difference. Thanks for the suggestions on the on the MM solder joints. I will check those.
My Cary PH 302 phono amp MM hum?
My Cary tubed PH 302 phono amp sounds great running an Ortofon Rondo Blue through the Moving Coil section but it has developed a hum with my Shure V15 III in the MM input. I have experimented with all the usual suspects that can be related to ground loop feedback. So far nothing has worked. The tubes test perfect. I have the same hum with a variety of cartridges and turntables. Has anyone had this problem with this phono stage? Thanks.
Sharpe
Sharpe