Dover wins the Kewpie Doll...ππ
When I changed the support of my Victor to the
steel cradle two years ago, I removed the flimsy perforated metal screen surrounding the 'guts'.
Well it turns out that this metal screen was acting as a Faraday Cage for the electrical emissions from the motor power supply.
Without the screen absorbing and neutralising this energy.....the cartridge apparently picks up the 50/60Hz emitted frequency at very loud amplification levels (I can't imagine that the platter is vibrating at this frequency?).
This is why there is no feedback issue with my primitive (sorry Aigenga π) original support system.
And yes.....when I place the Victor into the granite cradle with the screen attached.....no feedback πβΌοΈ
This however gives me a dilemma.....I would prefer not to have the screen attached as there are audible benefits without it. I also don't believe the screen is as effective (being tight up against the granite inner wall) as I believe a Faraday Cage should have both sides of the metal screen in free air?
I have orderred Mu Metal sheet and wondered if this was a possible alternative to the Faraday Cage?
Is it OK to wrap the
power supply transformer in Mu Metal or will it get too hot?
Would it be better to line the inside of the granite cradle with the Mu Metal instead (or also)....or am I doomed to using the metal cover forever?