Well, those turntables are very well made and strong. Audio equipment does not like lack of use though.
One theory about your platter speed is that the relay has oxidation due to the lack of use. Now that you have started exercising it the relay contacts are finally connecting. It would be best to replace the relays of course. At 41 years the platter motor likely could use rebuilding. Check out the

This is hardly a relay. At the beginning of the topic, I said that speed 45 always worked from a key press, but never worked automatically. Now it works everywhere. I looked at the diagram, is the 1C21 capacitor responsible for this? Can such capacitors wake up from forty years of hibernation?

Slava74 wrote:

This is hardly a relay. At the beginning of the topic, I said that speed 45 always worked from a key press, but never worked automatically. Now it works everywhere. I looked at the diagram, is the 1C21 capacitor responsible for this? Can such capacitors wake up from forty years of hibernation?

Yes.
And to some extent, yes.

But it will never be a good capacitor again, and the rest of the capacitors will be marginal too.
It's safe to say that all of these decks are in need of a thorough service/restoration in order to operate reliably again.
Caps, trimmers, relays, lamps, cleaning, lubrication, adjustments etc...

Martin

Martin and Sonavor thanks for all the tips. I am in the process of moving to a new home, so I only gave this deck a full cleaning, lubrication and mechanic setup. But I ignored (of course temporarily!) replacement of radio components. I have, among other things, the education of a radio installer, which I received in my youth. But in my area there is a problem with original high-quality radio parts. I would later like to order a set of branded necessary radio components for my beogram. I hope there are people on this forum who can provide such a service?