@fredb72 - what's youe setup - e.g.
- Cartridge
- phono amp or pre-amp/amp with phono
- cable from turntable into phono input
Hum can be very difficult to get rid of and can be due to
- the cables from the turntable
- the grounding on the arm
- the phono stage (when it has a 2 prong plug or wal-wart supply)
Regards - Steve