P7 owners

[radiance]

@gabriel1998:
Since the hum phenomenon is not related to ground loops but immanent due to the fact that a synchronous AC motor is generating a stray field which is being collected by the MM cartridge, there is no need for a ground lift switch at your phono stage...

Changing to a DC motor or using a MC cartridge e.g. Rega Apheta would help here!

Best regards

Rad

[Lelolee]

Had the same problem with my exact. Changed to Rega Apheta

[GR350]

Thanks for the info guys. I'll pass it on. My friend sent his P7 to Dallas for a P9 motor and MU metal shield upgrade so I'm interested to see if that attenuates the hum. From what I have read here it sounds like it might be good to change to a MC too. Since he just bought the unit with a new Exact, I figure he'll run it as is for a while. This brings up a question- Can the shield be added to other models or is it only possible on the P7? Anyone try this?

[radiance]

@GR350: The mu-metal shield should be mounted easily to the less expensive Rega models as well. What is the price for the shield and where to buy? Any info is welcomed!

Regards

Rad

[radiance]

@GR350: The Rega P7/P9 motors are identical! No need to change! AFAIK the P7 also already owns the Mu-Metal shield, can someone confirm please? IMHO the difference is the ceramic platter and the wooden plinth.

Regards

Rad