littleb,

Philmore?? Good heavens, is that still around? That was the brand name of a crystal set I built when I was five years old. No wonder it has hum!

Seriously, it's likely a ground loop. Try reversing the AC plug on the Philmore power supply, or connect a single ground wire from the turntable chassis to the Philmore chassis or the AV receiver chassis.

Alan Lofft,
Axiom Resident Expert (Retired)