[morzh]

Today I rewired the cabling to the turntable.
I realized that the shielded cable that had two wires in it was not shielding them well: when the wires were cut flush with the shield there was still a significant hum when the cable was attached to the radio input.

I took two well-shielded wires, ran them as a dual cable, used the two centrals as the signals, one coming to the GND, and then the shields bringing GND to the turntable's chassis.

It quieted the whole thing down quite a bit. The hum (at maximum) was not overwhelming in the first place, but what I did reduced it quite a bit. I also pasted copper adhesive foil over the wires that go from the switch (that disconnects the cartridge from the cable) to the tonearm (about 2 inches or so, so it was picking some noise) and soldered a short wire that I also attached to the GND I brought to the turntable's chassis.

I think I will stop my further attempts to reduce the hum as now it is not really pronounced anymore even without the music, and when playing, even not loud, it cannot be heard at all.

Time to put it all back together.