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Speed Stability

I have been fretting about the speed of my vpi for about a week now. I do not have a test LP or a strobe mat but I feel that if there is a speed issue. I am hearing the pitch fluctuate up and down on notes that are held out. I have compared some recordings to a CD version and have gotten mixed results. For instance:

On the first track of John Coltrane Quartet Ballads, I noticed that the ending note on the the first track tended to sway like an old VHS tape compared to the solid pitch of the CD version.

a first pressing of Dark side of the moon compared to my anniversary CD copy resulted in no significant changes in pitch that I could hear.

I guess what Im trying to get at is could that be a issue with the speed of the pressing itself, or could it be that some records show off a problem with my rig more than others. I hope it hasnt just started to be a thing thats just in my head. I think my next step is to take the Coltrane over to my fathers direct drive technics and see if the pitch continues to sway or not.

I would appreciate any input on the situation. Thanks

Darren
macd

Showing 1 response by macd

macd OP
103 posts
 
Hey guys

First I will say that I have an upgraded heavy weight screw clamp so I know its not that. I thought it was my belt for a bit so I boiled it and it shrank back down but did not help the problem.

What is interesting is the comment you two made about an off center pressing. The ballads lp is the most off center pressing in my collection and a bit warped to boot. (like a week old go figure). Anyways for some reason it never crossed my mind that it was the arm tracking horizontal that was making the wow.

Hifimaniac - How much increase in performance can one achieve with the SDS? Can upgrading the motor to a 300 rpm also result in better speed stability?

Thank you guys for clearing this issue up.
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