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Turntable speed accuracy

There is another thread (about the NVS table) which has a subordinate discussion about turntable speed accuracy and different methods of checking. Some suggest using the Timeline laser, others use a strobe disk.

I assume everyone agrees that speed accuracy is of utmost importance. What is the best way to verify results? What is the most speed-accurate drive method? And is speed accuracy really the most important consideration for proper turntable design or are there some compromises with certain drive types that make others still viable?
peterayer
john_gordon
116 posts
 

Peter,
Having extra flashes would not necessarily be more accurate or enable small period variations to be seen. That would depend on the indexing accuracy of the machine used to make the multi flash Timeline. A typical Rotary Head might be a factor of 10 less accurate than the performance of your deck in percentage terms as shown above, and certainly less than the clock in the Timeline.

John
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peterayer OP
1,382 posts
 
I am hoping to establish a video database of various turntable speed test results. The thread is over on WhatsBestForum. Here is a link:

http://www.whatsbestforum.com/showthread.php?13137-Turntable-Speed-What-matters&p=239164#post239164

So far, I've only posted Halcro's excellent Victor T101 video and my own video of the SME 30/12. Perhaps in time, there will be more turntables added. If anyone wants to upload such videos to YouTube, I will gladly add those links to the WBF thread in a list in post #1.
lharasim
130 posts
 
I really enjoy reading about this topic!. as most of us have been through many different TT combinations etc.. think its possible to come up with a workable compromise..

I did post up a video but some people had a laugh at it as i have no idea why but it clearly showed with a hi quality strobe that groove modulations and my finger did not pose a problem for this fantastic turntable...let me tell you i put a fair amount of pressure much more then 20 tonearms!

The table is the Pioneer pl L1000A.... quiet as its kept, it has some of the best electronics for controlling the hung rotor motor! If i had a timeline or equivalent i would post up a video but i do not ...anyone want to borrow one?

Lawrence
Fidelity_Forward
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