Turntable weight affects speed

The weight is 291.6 grams.

so, @jea48, the speed should not have been affected by additional weight?  The power supply (claimed to maintain exceptionally accurate speed - designed by the Acoustic Signature designer - they seemed to use the ps on platters of various weights) should have just increased its current and maintained the speed?  So this was probably caused, as @noromance suggests, by belt slippage?  

it’s an unsprung, 46 lb tt, eliminating vibration sufficiently was a challenge; I thought a weight might contribute to the solution

The weight is 291g (10.25 oz).

the tt was designed by Acoustic Signature, and is very similar to theirs, at the time. AS sells weights c. 280 g.  So it seems like the ps should be adequate.  Unless… the weight is c. 1 oz too heavy?

so if I understand correctly, @jea48 explained that the ps should just increase current to maintain the speed.  So @noromance must be right, it has to be belt slippage? - which shouldn’t happen.  That belt is small and flimsy

Oops, first response wasn’t showing up

Hand spinning will get it up to speed. Once up to speed, the load on the belt/motor should be the same with or without the weight (physics). If it is different, then you have something dragging or a bad bearing that results in extra frictional force exacerbated by the weight.

I asked someone at pro-ject if I could use the same weight I use on my VPI Classic on the carbon TT and he said NO, too heavy for that TT. So, yes. Not every TT is built to handle those weights.