A scope would provide the best view of the pulses but you can try to rearrange
the sensor slightly inwards or outwards and see if it changes anything.

The humming once per revolution is a typical symptom of a bad
tachodisc (not in this case unless some holes are blocked or the disc is dented) or misadjusted opto sensor.

Alternatively, measure the voltage across the sensor when over a hole and while not  (rotating the spindle
very little by hand).

The eddy-current coils are quite power guzzling ones and if not run correctly, they will easily
draw enough current to blow the fuse.

Martin

hi martin!

i measured voltage acros the sensor and it seems to work. when blocked, it reads out ca 15volts, otherwise it´s around 3 volts.

the humming is rather constant and not once per revolution and starts as soon as the gram is plugged to mains, but becomes louder, when play is pressed and the platter tries to go to 33.33 rpm.

jens

You are not using a 60Hz transformer module in a 50Hz area or vice versa ?
Beogram 6006 / 8000 / 8002 won't work with stepup/stepdown voltage converters if the mains frequency
is wrong compared to what is printed on the transformer module. The transformer module needs to match the local
mains frequency.

I wish I could guide you further, but I think this is one of the cases where a trained
technician needs to take a look at it.

Martin

hi martin!

no, it´s the right transformer, and as said after i replaced the caps, it worked perfectly for nearly two years, problems just came up last week.

i think i will put the beogram off the desk for some days and give it another try then...

thanks a lot martin for help and patience!

have a nice weekend!

jens