Thorens 320 speeding up

On 33 ok, but 45 gives some sound.

[@guilhermedealmeida2299]

This is the clutch engaging. It is a built-in design to make the turntable start smoother protecting the belt from stretch tension

[@kostependrhs]

Mine gives that sound too if started at 45 rpm. I start it at 33 and without stopping it,i switch to 45.
But i wish i could find whats happening.