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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
dover
2,290 posts
 
Tonywinsc,

For records with holes out of centre my engineer mate simply uses a thread file ( very small round file ) to open the hole up only in the direction you need to move the record to centre it. Then puts a marker on the label to indicate which side of the elongated hole butts up to the spindle. This seems to work reasonably well.
tonywinsc
583 posts
 
Dover, good suggestion. I have a small, round bastard that should do the trick. I might give that a try.
thuchan
1,009 posts
 
The Allnic SpeedNic works pretty well. I have put two images on my page (last two images when scrolling down)

best @ fun only
halcro's avatar
halcro
2,664 posts
 
My KAB strobe works pretty well also.
With it....the Raven keeps perfect speed.
If you want to be happy.....use a strobe.
If you want the truth.....use the Timeline :^)
dertonarm
1,042 posts
 
Halcro put it in the most precisely manner. The Timeline may be frustrating in it's accuracy, but then it is not the Timeline's fault. Very interesting too, to watch the laser beam over the whole record side ( record it with a camera - it is too boring looking there all the time).
On many turntables one may notice shifting back and forth and correction with controlled motors during heavily modulated passages.
A nice lesson in stylus drag and it's not linear nature.
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