Peter :
Hi. The Beogram problem is a common one - I have summarised an excellent thread and posted it in this FAQ.
The Beomaster problem is also quite common and probably needs the mechanism cleaning. Taking these apart is tricky - or at least putting them back together is! How brave are you!!
I am pretty brave the slide was actually preventing it from working at all so I put a bare copper wire under the slide and it came on and played .I did spray a bit of deoxit in there but did not take it completely apart .
I have owned several Bang & Olufsen stereo's but always sold them due to them needing too much work but this one is in nice condition other than the missing wood pieces which I will replace with some nice teak
thanks so much for you help