Bad speed setting trimmer.
Cracked solder joints.
Dry motor bearings.
Wrong belt.
One or more of the above.

Martin

Okay, so i will try to go through each possibility...

I already replaced the belt with one of yours, Dillen, so this should be fine :)

Just for your information: on 33rpm everything works just perfectly! So things like the bearinga should affect both speeds, shouldnt it?

TISE wrote:

I already replaced the belt with one of yours, Dillen, so this should be fine :)

You can certainly rule the belt out then, yes.

TISE wrote:

Just for your information: on 33rpm everything works just perfectly! So things like the bearinga should affect both speeds, shouldnt it?

Well, yes that should make sense - but then again...
I have seen motors running fairly fine on one speed but screeching and whining at the other.

First things would be the trimmer and the solder joints - particularly at the boards connectors.

Martin

Okay and how do i check the trimmer?

I can check the board by unscrewing the 3 Screws below the turntable-plate, right?

You go inside from the bottom.
Platter off, cartridge off, counterweight off.
Beogram upside down on a towel or similar.
Losen the three screws holding metal brackets at the back of the Beogram just a couple of turns (DON'T touch the other three screws as they
hold the lid spring).
Losen two screws at the bottom plate and take it off.

Does your board look like this?

Thank you very much for the good instructions!

so just cartridge and counterweight off, cueing arm stays on?

I think at first i will try to cealn the contacts and if this doesnt help i will open the turntable. Should be able to clean them from above, right?

Then i will also have a look which circuit board i have!

Thank you very much, Dillen!

Ah, and shall i use „real“ contact cleaner or am i good to go with isoprop 70/100?