Well, I have a partial solution: Ran a ground wire from receiver chassis to table chassis. No hum if table is running, hum when turned off. Also hum (different) when arm is lifted with finger, goes away when arm/cartridge on disc. Strange huh?
Vintage Problem
Confused about this...Recently had a mint Scott 340 tube receiver restored and found a Fairchild 412 turntable and a NOS Fairchild 500 tonearm. This is a system I first had in the early 60's. I'm using a Shure 44E cartridge. Problem is I have a hum using the phono input only when I place the arm on a disc. The tomearm has a four prong plug-in cable and no separate ground wire. When I use another table, an Acoustic Research which has a ground wire, there is no hum. Should I try to ground the chassis/motor of the Fairchild table to the ground screw on the receiver? If anyone has an idea I would love to hear from you......