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Beosystem 6000 : out of lenghty storage

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AndiPandi
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Denmark
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AndiPandi Posted: Mon, Apr 1 2019 10:39 AM

Hello Beo-gurus

I have finally got the time and space to get my beloved Beosystem 6000 out of storage. It has been stored at roomtemperature, out of direct sunlight and in the original packing boxes.

It consists of the following:

Beomaster 6000 (type 2251)

Beogram 8002 (MMC2)

Beocord 8004 HX Pro

2 x Beovox M75 (on stands)

All are 220volt  .

I have a couple of questions :

1. Is there anything I should do before I plug them into the mains ?

2. Since they were last used the mains voltage here in Denmark has changed to 230v, should I be concerned ?

3. I am planning to change the electrolytic capacitors in the M75 crossovers. Does it make any sense to change the value of the capacitors as per the service manual specs for the speakers ?

4. I am considering splashing out on lower tolerance electrolytic capacitors i.e. +/-5% or +/-2% . Does that make sense ??

I appreciate help with any or all of the above questions.

Best wishes

Anders

Dillen
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Copenhagen / Denmark
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Dillen replied on Mon, Apr 1 2019 9:31 PM

1. Is there anything I should do before I plug them into the mains ?

There's not a lot you CAN do.
If they stood for a very long time, the Beocord will need fresh belts and idler wheel rubber parts. and all mechanical things will
need cleaning and fresh lubrication.
They will more or less all need a thorough restoration by now.
I wouldn't expect any of it to work as intended - just like that.

2. Since they were last used the mains voltage here in Denmark has changed to 230v, should I be concerned ?

Generally no.
Everything running on mains must accept at least +/- 10% tolerances on the mains voltage. Many things even +/- 20%.
Running on 230V instead of 220V is nothing to worry about in case of the mentioned Beosystem.

3. I am planning to change the electrolytic capacitors in the M75 crossovers. Does it make any sense to change the value of the capacitors as per the service manual specs for the speakers ?

Does the service manual suggest replacing the capacitors to different values?
It would make sense to replace the electrolytic capacitors like for like, -
 based on what's originally fitted.
Fitting other values would make absolutely no sense unless you also fit other drivers or move to a different cabinet or do some other drastic changes.

4. I am considering splashing out on lower tolerance electrolytic capacitors i.e. +/-5% or +/-2% . Does that make sense ??

Only if it makes you feel better.
The speakers won't play any better or worse.
The tolerances are typically stated only within a certain frequency range, and there are so many other factors
involved in a speaker like this.

Martin

AndiPandi
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Denmark
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AndiPandi replied on Mon, Apr 1 2019 11:11 PM

Hi  Martin

Thanks for your answers.

With regards to the capacitors, they have, as an example, a value of 47uF printed on them, but in the servicemanual the are shown as 50uF. Just wondered if B&O being able to buy in bulk, might have had capacitors that measured 50uF ex factory, even though they have 47uF printed on them.

Or are the differences too small to really matter ?

Anders

 

Dillen
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Copenhagen / Denmark
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Dillen replied on Tue, Apr 2 2019 7:14 AM

AndiPandi:

Or are the differences too small to really matter ?

Exactly.
50uF was an old standard value (like 25uF, 32uF, 8uF etc.), where 47uF is the closest current standard value.
Besides, the difference is only about 6%, so still well within the components own tolerances.
Similarly 32uF could be replaced be 33uF.
8uF could be replaced by 4,7uF in parallel with 3,3uF.
25uF with 22uF parallel with 3,3uF etc.

Martin

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