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This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022

 

Beogram400c Hum

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murraym
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murraym Posted: Wed, Jun 30 2021 1:24 PM

Hope someone can help. I have just purchased a beogram4000c. When I connect it to my Ouverture through the Aux socket I get a very loud hum, especially when the stylus contacts the vinyl. I have a One Remote RIAA-II connected between the Ouverture and the Beogram.

I have also tried connecting the Beogram to a Marshall amp/speaker with the same result.

In both cases all the units were powered from the same mains ring.

Anyone have any ideas.

BeoJosh
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BeoJosh replied on Wed, Jun 30 2021 4:27 PM

Congrats on the 4000c. I'm eagerly awaiting mine. The 4000c has a built-in phono preamp, so you would not need to have another phono preamp connected in between, and although I've never tried it I would assume having a double preamp connection would likely cause a hum or distortion from too much gain. Have you tried connecting the 4000c directly to the Ouverture without the external preamp?

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murraym
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murraym replied on Wed, Jun 30 2021 8:20 PM

Hi Josh thanks for getting back so quickly. Originally I tried it without the pre-amp and it had the hum. Apparently it requires the pre-amp to work with the Ouverture, so bought one - still the same issue only could now hear the vinyl with hum. Thought it might be a ground loop issue so moved everything on to the same mains ring - still the issue. Also tried it with a ground loop isolator to no avail.

murraym
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murraym replied on Wed, Jun 30 2021 8:29 PM

Hi Josh, should have been a Beogram 4004 not the 4000c. not sure what the differences are. I take it you have bought a new one - nice

Dillen
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Dillen replied on Wed, Jun 30 2021 8:45 PM

murraym:

Beogram 4004 not the 4000c. not sure what the differences are

RIAA / no RIAA.
Different grounding requirements accordingly.

Oh, - and around 9000 euros on the price tag.

But a Beogram 4004 is still a very nice deck if restored properly.

Martin

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