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clip on RF chokes

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papabearjew:
All caps have already been replaced

ataudio:
Many years ago when I had a TT I must have been lucky.  Never had any issues with hum on my old AR, B&O, a couple of Duals and finally my  Micro Seiki.  Throw in in some super cheap Technics, Fisher, etc.  Never any issues.  Without knowing what you've tried I would
1) move TT to a second system to see if problem follows TT....maybe its your preamp's phono section that has the issue
2) relocate TT away from large transformers
3) move cables away from large transformers
4) try isolation transformer on TT ac line
5) check cart wires from cart to rca jacks
6) try cheater plugs on certain equipment to reverse plug polarity

Did this just start?

papabearjew:
Everything has been done but item 4. This started several months ago.

ataudio:
Hmmm.....any major changes around the start time? New this or that or corresponds with this hum starting?
Maybe even a new appliance that could somehow affect the TT????? Super long shot.
This seems like a very complex TT.  Not sure how long I could live with this.  I had  a
Jolida tube amp that hummed. Sent it back twice.  I imagine this would drive me nuts
If you can't borrow an ISO transformer you could make a cheap temp setup with two identical transformers back to back.
I've done this with a pair of 120/220v travel transformers.

Good luck

MacGeek:
PBJ,  do any of the components in the system have a three wire plug?  If so, try lifting the grounds (at least as a test).

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