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 mosin

Tony,

I believe what you may be missing is the sad fact that it may be impossible to fix everything, but all the little things add up, so we try to fix what we can. Look at a turntable the same way you look at an entire system. It will never be perfect, but nothing is left to chance that can be corrected with what is available to its builder.

If one thing is left wrong about a system, or a turntable, in a glaring way, the entire exercise is moot. Suppose someone built an absolutely perfect turntable, but it ran at only 23RPM. That would be obviously wrong. But, suppose someone built a turntable that ran one-tenth of one percent wrong. Would that be acceptable? Maybe, but would it be better, if the guy fixed the tenth of one percent error? Of course, it would. The question is how much can be left wrong, and to what degree.

Now, consider what happens when one thing is fixed that somehow manages to upset some other parameter, and you have the puzzle that turntable designers try to solve. It isn't easy, so they work within the constraints of what they know and can discover. They build with what they can manage to master, and with the help of their smartest friends.

At the end of the day, the hope is that their vision is realized, and that someone out there shares that vision.

Speed stability is one step along that unending path. There are plenty of others, yet to be mastered.

.