AC power supply for Nottingham Analogue

Whatever you choose to buy, in addition to speed (frequency) control look for a unit that will allow you to adjust the output voltage. IME with my Nott. Hyperspace adjusting the voltage to the minimum required to maintain speed is very audible and an improvement. Also, dual phase units (requires rewiring the motor and removing the capacitor) that allows for tweeking the phase (90 degrees nominal) between the two field coils in the motor while helpful is not as important as being able to adjust the voltage.

PS Audio Premier holds the voltage quite steady at 120 or 121. Still everything sounds better after the midnight.

Thank you all for your answers.
After talking to a Nottingham Analogue salesman, I'm going to try the Pro-Ject Speed Box DS. It's a more affordable solution that is proven very good.

migueca, 

how has the project speedbox performed with your nott? I have a 294 and would like to try an affordable option but the 3 watt power draw seems low. 

Would like to no if if you have had any functional problems, excessive heat? 

Also, did you notice any subjective improvement in sound? 

If you can still find a Phoenix Engineering power supply floating around, go for it, with or without the "Roadrunner" device that allows you to lock on to platter speed.  (But do also get a Roadrunner, if you can find one.)  I'm using these with my Lenco and works quite well to pinpoint and hold 33.333 rpm.