Beogram 1200 attached to Essence MK2 – loud hum

[zuegers07]

I have purchased a Beogram 1200, and when I want to listen to a vinyl record, there is an electric humming sound so loud I can barely hear the record.

The Beogram has a DIN 5 signal out cable, which I need to run through a Din5 / Cinch adapter cable so I can attach it to a Cambridge Audio pre-amp. From the pre-amp, the signal runs via a Cinch cable to the Beosund Essence MK2 via LineIn / Aux.

I noticed that the Beogram’s power cable has a Type-C power plug, meaning it has only two round pins without a third one for grounding. Also, there seems not to be a separate grounding cable I could attach to the pre-amps grounding wheel. I imagine that B&O did not consider this to be necessary at the time because Pin 3 of the DIN 5 plug provides grounding.

I read this article on how to ground a turntable:

https://vintagesonics.com/guides/turntables-guides/how-to-ground-a-phono-preamp-a-step-by-step-guide/

Should I go through all this trouble, or should I simply buy a cable similar to this one:

https://www.digitec.ch/en/s1/product/speaka-professional-cinchdin-connection-adapter-diode-socket-5pin-din-cinch-plug-with-earth-connecti-21603189?gclid=Cj0KCQjwrMKmBhCJARIsAHuEAPRM2m11YSIxEilB5vubtZs5TwU3hDX-1—rygPHqd2JbQXzfy3LxsaAiPOEALw_wcB&gclsrc=aw.ds

Thank you for your feedback!

Stefan

 

[AdamS]

Yes – buy the cable you have linked to.

B&O decks screen the cable connection through the body of the DIN plug and so when you use a conventional DIN to phono adaptor you lose this connection and hum is the result.

If you want to double check first, take a bit of wire and attach one end to the earth terminal on the Cambridge Audio preamp. Then, tough the other end on the metal shell of the DIN plug – the hum should vanish. As a quick cheat until the adaptor arrives, you can unplug the DIN plug, fold the end of the wire just over the lip of its metal body (away from the pins) and plug it in – this will hold the wire in place temporarily!

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