DC motors and outboard power supplies...


For those of you with analog rigs that utilize a DC motor and outboard power supply....I'm wondering:

1. How often do you check to see if the platter is at correct speed?

2. How often do you have to fine tune the speed adjustment?

3. Once fine tuned, does it stay throughout the listening session, or do you need to make adjustments throughout?

4. Would you be willing to comment on which table you are using?

Thank you for your comments.
no_regrets

Showing 2 responses by lewm

No regrets, Are you absolutely certain that the belt is not slipping? If it's neither the belt nor binding up of the bearing assembly, then have you been able/are you able to measure the electrical output of the PS when it is running well as compared to when it is running too slow? That at least will pinpoin the problem to the PS. You might want to reveal the identity of your tt, so that others who own the same rig and might read this thread could relate their experiences. For example, measure the DC voltage at the output of the supply under both conditions (if you have a DC motor).
No regrets, This is just my 2 cents, but if you don't know how the motor control circuit works, I would advise against random parts replacement. That can lead to confusing the issue, if you make an error. Anyway, I am sticking with the idea that you should measure some voltages during full function vs during problematic moments. It sounds like the problem IS localized to the motor or its upstream circuit.