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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
dev's avatar
dev
832 posts
 
Hi Lewm,

but using a mylar belt has it's own issues. Static, dust attracts to it, they only last so long before slippage occurs. You have to spend some time makeing them up all the time etc.

Sorry but I just want to listen to music and not be dealing with that.

I also tried on a Lenco, won't mention the seller but it was also off. I inquired about this and basically got back a answer that it's fairly close. hummm

I tried it on a "DD" SP10 MK2 and it was off, no way to correct like the MK3 offers speed adjustments so the owner has to send it in.

Albert I had asked you about your NVS, I'm sure you have checked it.

Can you tell us the results.
sarcher30
596 posts
 
Unfortunately bringing the motor closer to the platter also brings it closer to the cartridge as well. Which on the TT's I have had with that arrangement caused hum on most of my cartrides. There may be some TT's that sheild the motor well enough to pull it off.
tonywinsc
583 posts
 
The comment about using viscous drag or friction to dampen platter oscillations on bd tt's struck me. I do my own maintenance on my Sota tt. It is easy enough to disassemble the platter, clean and relube the spindle and bearing. I let it go for a few years and then about two years ago, I got around to pulling it apart and relubing it. I noted then that the tt sounded better, but I didn't really understand why. So now I clean and relube it every year. Some other Sota owners have also mentioned they found some synthetic lubes make it sound better than other lubes. I tried some synthetic lube last Fall and didn't notice a big difference in sound myself. The synthetic lube is very tacky and definitely added drag to the spindle compared to the lithium grease that I was using. Since my speed is pretty rock solid, I guess the drag is not too high.
ketchup
700 posts
 
Unfortunately bringing the motor closer to the platter also brings it closer to the cartridge as well.

It also results in less contact between the belt and the motor pulley. That seems like a bad idea because there's already so little contact there. Right?
sarcher30
596 posts
 
Good point Ketchup. The belt is more likely to slip on the capsan than the platter. Of course if it uses a sub platter that problem is reduced.
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