I for one commend RP for using the highly sensitive instrument he already had (his music system), rather than renting a vastly expensive instrument to do the same thing. Identifying the source of noise is pre-requisite to eliminating it, and that is always worth doing in a decent system.
RP, you might find that you prefer the Premotec 9904 111 31813 low torque motor, made expressly for audio turntables. It is 300 RPM AC.
RP, you might find that you prefer the Premotec 9904 111 31813 low torque motor, made expressly for audio turntables. It is 300 RPM AC.