I'm not familiar with that particular 'table but some require you move the belt to a different section of the platter or even a different drive pulley to change speeds. Take a look, that may be the case. Best, Jeff
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If I am correct the table has a switch that selects the two different speeds. When you switch it to 33, there is a divice that lifts the belt. Try to see if that little hook that lifts the belt is functioning. I had the same problem once on what I think was a similar Thorens and i just manual lifted the hook and it worked form there, it probably was a little stiff.