Beogram 3000 humming noise

[CharlieWednesday]

I had not used my Beogram 3000 for a few months as I replaced it with a BG8500 (to match my BC8500), but it was working fine when last used.  I was thinking of selling it but then decided to buy a Beosound 4 recently for another room, and will connect it to that.

I plugged it in (and it was quite late at night, and quiet!) and I noticed something – there’s a constant humming noise coming from it when it’s plugged in, even when not in use.  It’s very quiet and you have to be close to it to hear it, but it’s there.

First I thought it must be the earth (I had not yet connected it to my phono stage and BS4 yet as I need an adapter for that – awaiting that in the post).  My understanding is that the 7 pin DIN includes an earth connection, but since I will be connecting this to a Beosound 4 which only has RCA inputs, it won’t be earthed, am I right?

So, to test that theory I took it to the other room and connected it to by Beocenter 8500, but the humming is still there.  It sounds like it’s coming from the back-right of the unit, which I believe is where the transformer is.  Maybe it was always there and I never noticed it before.

I’ve fixed a few other B&O items but never a Beogram – I’ve only ever bought working ones.  Any advice would be much appreciated.

[Dillen]

The transformer is at the back left.
But it is most likely what you hear.
Does the hum go away when you lift the Beogram?
Has the deck lost its rubber feet?

Martin

[CharlieWednesday]

Actually it is back left sorry, I was looking at it from the back at the time!  It still has it’s rubber feet.  Right now I can’t hear the noise at all (I’m hoping it’s just magically gone away!), but I’ll listen again closely tonight when the house is quieter.  We’re having some work done at the moment in the kitchen so it’s quite noisy right now.

[CharlieWednesday]

I was able to try it again when the kitchen fitters downstairs had stopped for a brew and it was quiet!  I would not say the sound disappears completely when I lift it up, but it does definitely lessen.  While the rubber feet are still there on the underside, they are quite flat and have probably lost a lot of their original softness.  I do have some 3M adhesive rubber feet so I’ll put some of those on tonight when it’s properly quiet in the house, and try it again.  Thanks for the advice.

[Dillen]

A transformer will always hum a bit. It’s in their nature.
New correct rubber feet are available – visit our sponsor Danish Sound Parts.

Martin

• This reply was modified 1 month, 1 week ago by Dillen.

[CharlieWednesday]

Ah, there’s a couple of bits I need from Beoparts shop (now: Danish Sound Parts) anyway so I may as well add those to the order – thanks.

I know a transformer will hum of course, it was just that it was loud enough to hear in a quiet room.  Only just, but you can hear it if your near it.

 

Edit by Dillen

• This reply was modified 1 month, 1 week ago by Dillen.

[Author]

Posts