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Malcolm
Posts: 4
(@malcolm)
New Member
Joined: 4 months ago

Hi Johnnie

Thanks for those suggestions - on further investigation it seems that I have a 50 Hz hum on both left and right channels. I'll check the state of the connections on the cartridge tags. Presumably I could check with a multimeter for continuity between each of the cartridge tags and the RCA connectors signal pins and ground shields? Would this tell me if there was a break in the internal wiring of the arm?

The induced magnetic hum might be a consideration - the power amp is a Krell KSA 50 and I know that these have a fairly beefy power supply and so this might be the source of the problem. The LP12 is on a Quadraspire wall mounted shelf and at present the Krell is at roughly the same height as the LP12 on the top of an adjacent rack about 25cm to the right of the turntable. I normally would house power amps lower down in the rack, but the depth of the KSA50 is such that the speaker terminals on the rear panel foul the back plate of the rack, so I had to put it on the top shelf. Over the weekend I will try moving the Krell away from the turntable to see if it is an induced hum. If there's no change, I will be out of ideas!

I understand your reluctance to take the risk of receiving the Zeta by courier - I read some of your earlier experiences with companies like Hermes! I still have the hinged wooden box that the Zeta was originally supplied in - doesn't that provide sufficient protection for transit?

Thank you for taking the time to have this conversation with me.

All the best

 

Malcolm

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Malcolm
Posts: 4
(@malcolm)
New Member
Joined: 4 months ago

Hi Johnnie

In line with your suggestions I did move the Krell down in the rack so that it's well away from the LP12, but the 50 Hz hum remains on both channels. Removing the flying earth strap from the pre-amp makes no difference to the level of hum either which was a bit of a surprise. I'm now at a loss as to what to do next. I would very much like to keep my Zeta if at all possible, but if I cannot get the earthing issued resolved it's pretty much useless. Everyone I have spoken to has recommended you as the recognised expert in arm matters, so I wondered if you would re-consider taking a look at the Zeta with a view to re-wiring? 

All the best

Malcolm

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1 Reply
johnnie7
Moderator
(@johnnie7)
Joined: 9 months ago

PU7 maker
Posts: 24

@Malcolm hi buddy

 

please email me and let me know what part of the UK you are in and ill work with your local dealer to find and fix the issue

 

 

bw

j7

 

 

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