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

 

Beocenter 7700 acoustic feedback rumble

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Christian Christensen
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Stockholm
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Christian Christensen Posted: Sat, Dec 20 2014 6:17 PM

At not acceptable level. the entire system seems sensitive

light taps with my finges on the system is hearable in the speakers.

The system feedback very easily

transport screws loosened, of course.
It seems like the system is horisontal.
BC stand on the standrd B&O furniture.
Speakers are MC1200

Any tips ? 

My re-capped M75 are my precious diamonds.

Lee
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Newcastle upon Tyne UK
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Lee replied on Sat, Dec 20 2014 6:22 PM

Maybe the leaf springs on the suspension need adjusting...

Christian Christensen
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Stockholm
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yes maybe, are they to have a certain adjustment ?

My speculation is if any caps in the RIIA section has collapsed, thinking of that there should be a traditional rumble filter on 15 Hz should be part of the design.
When I turn up the colyme there is a constant rumble in the background that is just waiting to turn into feedback 

My re-capped M75 are my precious diamonds.

Lee
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Newcastle upon Tyne UK
Posts 734
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Lee replied on Tue, Dec 23 2014 2:59 PM

The platter needs to be level with the plinth for the suspension to work properly. Too high or low and the damping effect will disappear.

The rumble could be caused by a bad bearing... try a couple of drops of sewing machine oil in the centre bearing.

 

Christian Christensen
Top 150 Contributor
Stockholm
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Thanks, Lee, problem solved.
It was the suspension screws.. I spend alot of time with them today, to figure them out

They need to be quite tight . the weight of the platter and a record pushes it down.

Now playes wonderful loud with a new pressed 180grams from Canada, Leornad Choems last album

:) 

My re-capped M75 are my precious diamonds.

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