Nottingham TT - external power supply?

Have had the Nottingham Spacedeck/Spacearm for about 10 years or so, with the Benz H2 high output moving coil cartridge. Only have about 400 or so hours on the rig, but was considering a lower output cartridge which would allow me to use the MC setting on my Cary PH-302 phono pre-amp. After the usual research, many opinions offered suggested that a bigger improvement could be made by adding a speed control device for the Nott motor. Bought the Walker Motor Controller, despite cringing about the cost, and plugged it in. Interestingly the platter speed showing on the KAB strobe disc was perfect, no adjustment was necessary. Of course I had to adjust it anyway, and managed to get it back where it was supposed to be, a perfect 33.3RPM. I wasn't sure what to expect, but I was more than a little surprised at the immediately improved bass reproduction. Deeper, more musical, more realistic. Wow! Then I noticed (have you heard this before?) there was more detail. I was hearing cymbal taps I'd not heard before, background vocals were more distinct, rhythm guitar chords carved out their own space more clearly. Willie, Bonnie and Otis's voices sounded more lifelike, palpable, real, immediate. I didn't expect this from such a seemingly simple device. I wished I'd bought the Walker a long time ago.