I looked into getting a Long Dog Audio PSU @ £895.
The main benefits for buying this PSU are :-
1. You can control the voltage and in theory control / lessen vibration getting into the platter from the motor.
2. You can generate a more or less perfect sine wave for 50Hz which if variable will cause platter speed differences.
3. It generates a clean supply with very little total harmonic distortion.
So what did I do? Well I cheated I used a PS Audio P10 and smart plinth design.
My PS Audio P10 allows me to control voltage to specific plugs. So I now run 220 Volts into my 401 and I decoupled my 401's motor from the main chassis so
the motor generates even less vibration and it still does not get into the platter. This was done via the Martin Bastin plinth. The P10 generates a very clean electrical signal with ~0.1% distortion alongside a near perfect 50Hz sine wave, so virtually nil platter variations. The 401 runs between 33.3 and 33.4 RPM.
So the £895 still sits in the bank and I'm one less box and power cable in my listening room.