A good LP test record (which any vinylhead outht to have) includes a "silent groove". I think you need more time than permitted between tracks, and the record will be changing speed when you shut off the power.
A Simple Test
Maybe everyone is already doing this andI'm the last one to figure this out, but I've tried a simple test to determine the degree of motor noise that is transfered to the cartridge.
Find a good clean record which has a longer time between a couple of tracks and, while the record is playing between tracks, turn the motor off and then back on. You'll probably detect the disappearance and re-appearance of hum and/or rumble. Any noise remaining when the motor off will be from other areas (surface noise, bearing noise, etc.)
This has been quite useful in helping set proper belt tension (more tension= more noise) and also identify differences and problems in motors as well as quickly identifying whether a motor or belt tweek was useful in reducing noise.
It's been quieter around here lately....
Jim
Find a good clean record which has a longer time between a couple of tracks and, while the record is playing between tracks, turn the motor off and then back on. You'll probably detect the disappearance and re-appearance of hum and/or rumble. Any noise remaining when the motor off will be from other areas (surface noise, bearing noise, etc.)
This has been quite useful in helping set proper belt tension (more tension= more noise) and also identify differences and problems in motors as well as quickly identifying whether a motor or belt tweek was useful in reducing noise.
It's been quieter around here lately....
Jim