Hum in a phono cartridge?


Hey everyone, just kind of thinking out loud. Phonograph cartridges are balanced, and should be isolated from the rest of the turntable, electrically, right?

So then here do any ground loop problems come from?
erik_squires
When you unbalance the phono cartridge, you connect ground to neutral. The difference in electrical potential is between whatever minute voltage is on the ground and 0V, which is where the neutral should be, no?
When you unbalance the phono cartridge, you connect ground to neutral.

If you mean AC, then no.

Otherwise, are you calling ground the preamp shield conductor and neutral the catridge (-) ??
erik_squires
If you mean AC, then no.

Otherwise, are you calling ground the preamp shield conductor and neutral the catridge
No, we're not talking about AC here. We're talking about phono cartridges.
A phono cartridge ground loop could come into existence if the cartridge body is not electrically isolated from the headshell / tonearm assembly, _AND_ one of the negative polarity right or left cartridge terminals is bonded to the cartridge body.