Rerurn to Romy the Cat's Site
In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: AC cord sensitivityPosted by N-set on: 12/4/2020
Looks like I've found a solution but I don't understand it:
1) Lifting the phono ground from the PP with a cheater plug and connecting the phono case to the SAME PP ground with a separate cable not only does not bring the 100Hz noise back but actually diminishes it! So the phono wants to be grounded to PP but via a separate cable, not through an AC cord.
2) Changing in the above setup an ordinary utility AC cord used for experiments to my DIY braided solidcore and BUM +7dB noise increase
3) Changing to Furutech FP-alpha 3 cord and the noise is lower than with the DIY braid but some 3dB higher than with a cheap utility cable
4) Changing the ground connection wire to an amperemeter shows a negligible AC current of 0.4mA between the phono case and the PP gnd, so this i100Hz noise is most probably not a ground loop but an induced voltage in the AC cord?
I have no idea what is going on. Anyone any clue?
Anyway, I plan to do like Romy said - move PP some 2m away from the rack and bring the power from it via a single powerstrip. Then grounding the phono to the powerstrip or to the PP via a separate cable.
Rerurn to Romy the Cat's Site