Hi Simone,

With these vintage audio components the function of their circuits begin to degrade as the electrolytic capacitors degrade...and become far enough out of tolerance. Spot fixing a problem with audio equipment this old will usually mean having to repeatedly come back and fix another problem later. So the best thing to do first is a restoration where you replace all of the electrolytic capacitors with new components. I recommend replacement using the same type of capacitors (electrolytic) at the same capacitance value and DC voltage rating as the originals. It is very rare and unusual to need to replace a ceramic capacitor so only deal with the electrolytic capacitors first. Tantalum type capacitors can also fail so you might consider those while replacing the electrolytic capacitors. 

Do you have a capacitance meter to check the capacitors as you remove them? If you are unsure of getting the correct replacement capacitors yourself then I would contact Martin Olsen (Beoworld user "dillen") of Beoparts. He can provide capacitor replacement kits for various vintage B&O audio equipment.

Regarding the behavior of your Beomaster 6000 and the logic there is a microcomputer integrated circuit (IC) device that makes decisions based on the signals it monitors. When voltage levels become incorrect or signals are incorrect, both as a result of old capacitors in the circuit, then you start to get unreliable operation. The Beomaster also has a protection circuit for its power supply so that comes into play. But as I said, the first step is to replace all of the old capacitors first. Then re-evaluate the Beomaster 6000 for any problems after that. Otherwise you could be chasing one problem after another due to the capacitors.

-sonavor

Thank you very much for the clarifications and suggestions.

Yes, i have a multimeter to test capacitors.

I did not know there was a repair kit for the Beomaster 6000,

I contact Martin Olsen to know the price and shipping to Paris.

I have seen that some capacitors, especially the 40 volt ones, are not easy to find. I wondered if it would be useful to include photos of the repair to help others in the adventure.

thanks a lot

Simone

Sure, photos are always encouraged.

Regarding the replacement capacitor voltage rating...I always try to match the original rating but if it isn't available then I go up to the next closest value (always up, never lower of course).  So instead of 40V you might go with a 50V rated capacitor. 

-sonavor

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Ok, so before opening "the patient" I get the capacitors of the power supply. Are there other capacitors in other areas that are better to change to save time?

Thanks

Simone

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Plan on changing all of the capacitors. 

I found this 2019 Beomaster 6000 restoration post by Beoworld member Craig.
His project has some nice photos of the inside and will give you a good idea of the scope of the project.

One of my very first B&O restoration projects was back in January 2012 (Wow...9 years ago) and it was also a Beomaster 6000. It is over on the Archived Beoworld Workbench Forum.
I posted a lot of good photos and I used Martin's Beomaster 6000 capacitor kit so it shows you that. Eventually I ran into some problems I couldn't solve at the time. I am happy to say that later I solved my issues and I have that Beomaster 6000 in my listening room, along with some other vintage Beomaster, Beogram, Beocord and Beovox components.

-sonavor

Your post is a gold mine.

But an obvious consequence of so much information is my real ability to assimilate and make it operational.

I am in Dante's dilemma of the second cantos of hell.

Better to take things slow and read the various information carefully.

thanks a lot

Simone