I have one of Nick's LDA regenerating power supplies, which is made for decks with mains AC motors like Garrards and Lencos. It makes an obvious improvement.
Guess it could also be used with other decks as long as the rated output isn't exceeded.
“Music has always been a matter of energy to me, a question of fuel. Sentimental people call it inspiration, but what they really mean is fuel. I have always needed fuel. I am a serious consumer. On some nights I still believe that a car with the gas needle on empty can run about fifty more miles if you have the right music very loud on the radio”
Hunter S Thompson