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It's more critical to keep high voltage power cords separated from low voltage line or phono cables, but separated from the speaker cables is also good.
The hum could be internally generated in the amp. I have an older receiver that sometimes has some noise until it warms up after a few minutes. Yours might have a noisy volume control, or just about any component.
Question, does the hum get louder if you turn the volume up (without music), or is it constant, even with the volume at zero? Do you have the turntable and amp grounded together? Does the amp's power cord have a 3-prong grounded plug? If not, can you try reversing the power plug(s) in the AC receptacle(s)?
Thanks for the reply.
1. The hum does get louder when the volume is turned up (without music).
2. I do have the turntable and amp grounded together.
3. The amps power cord is 2 prong. Tried reversing the plugs, but no change in the hum.
If the hum gets louder with volume, it probably originates early in the amplifier circuit, or even before.
I wonder if you tried turning the amp on with the turntable and any other input sources completely disconnected? Just the amp and speakers.
I think the best aproach is to try and isolate the problem as much as possible. After that try out any other grounding options. There may be a problem in the amp, and temporarily substituting in a different amp could give you another clue.
Hmmmmm; Nad 3020; I had 2 of those back in the day...great little amp.
The first thing to try is to turn everything on so the hum is fairly loud, and unplug the phono cables from the amp inputs.
If that fixes it, it is a phono problem. Occasionally, it goes away if the turntable is NOT grounded to the amp, so try disconnecting that wire.
Grado and certain other cartridges are not shielded, and will hum with certain turntables. If you have a Grado cartridge, that could be whole problem. I had to send back a Grado cartridge and get a different one with my Music Hall 2.2.