Rega TT-PSU - Manual (Page 7)

Notes on the TTPSU special only (60hz):
When changing speed from 33 1/3 to 45 RPM on the TTPSU Special upgrade supply we
suggest you observe the following:
It is advised to turn power supply & turntable on with 33 RPM selected on the power
supply, and then selecting 45 RPM using the speed control switch on the power supply
unit.
We suggest you avoid selecting 45 RPM on the speed switch on the power supply box and
then turning the TTPSU or turntable power switch on, this could under some
circumstances cause the motor to stall and the turntable may not reach the correct
operating speed of 45 RPM.
When using the RP3 it is still possible to turn the turntable off using the switch on the
turntable, this is perfectly ok for short periods of non use. For longer periods it is
advisable to turn the TTPSU off. (see Setup - getting started section for information on
the RP3 TTPSU Special).
To switch off at any time, simply press the power switch on the front of the TTPSU.
To minimise the risk of hum pick up by the cartridge, the power supply should be situated
as far from the turntable as the interconnect cable will allow.