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
No Regrets; I find that since my rig is in the basement there is a wide variation of ambient temperature. Being so affects the bearing oil temp until it has reached a stable temp. I live in the Colorado Mountains. I do find a more measurable need for checking speed accuracy during the winter months then I do the summer months (which are few)!
Peace
Thank you to all who shared their experiences with me regarding this. I greatly appreciate it.
Dear No regrets: Looking at your thread and that in other one ( not yours ) you ask the same: Could I assume that you have speed " problems " with your TT?, do you? or which is the real subject: only curiosity?

Regards and enjoy the music.
Raul.
Hello Raul,

Yes, I am having issues with speed control in my rig. So, as I am trying to sort out these issues I am contemplating getting a new table but can't help but wonder if I might not have simalar problems with the new table. Therefore I ask questions of the fabulous members of this forum because I respect their opinions.

The problem that I am experiencing is that there are times that I can listen for hours without a problem, and then out of the blue my speed will slow way down. Other times I can't even make it through a single record.

I've changed the bearing oil, the belt, the battery in the power supply. I don't know if it is an issue with the motor or the supply. About a couple weeks ago, I cleaned the din plug that connects the power supply to the table and I had put on about 50 hours of listening without a problem. But now, here it is again. I'm getting stumped. Maybe I need to replace the capacitors and regulator chips in the supply. I don't know what the answer is but it is getting frustrating. I never know when it is going to happen except that it will probably happen for sure when I'd like to invite friends over for listening!

So do you have any ideas? Your thoughts would be greatly welcomed.
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).