If you can get a 6/5 bigger pulley on the motor it should work ok with a little engineering.
Check that the motor doesn't get excessive warm but its probably a shaded pole motor which should give no problems while providing a little more torque.

The tube amp runs via transformer + rectifier on DC and should be no problem as long it gets the correct voltage.
From your post I think its 110-115 Volts on its primary side?

So a 240 V / 110 V stepdown transformer ± 250 VA should work fine.

Note: check what the total VA or Watts rating is of the turntable amp + motor.

Good luck ! [Linked Image]

The product of rotation, excitation and flux produces electricty.