2. analog
  3. 1320876538

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
halcro's avatar
halcro
2,664 posts
 
And finally, all this chat is still overlooking what I thought was the real issue: speed variation due to stylus drag. None of the above mentioned observations really tell us anything about that. Unless sensitivity to stylus drag is gross, the Timeline may not reveal it.
Lew.......have you not tested the Timeline with and without 'stylus drag' yourself?
I assume all the comments on the Timeline tests are 'with' the stylus playing as demonstrated with 1,2,&3 styli engaged on my YouTube video?
I can assure you that the Timeline is the ONLY device currently available......capable of graphically demonstrating the most marginal of drifts due to stylus drag.
lewm
12,537 posts
 
Henry, I've done it both ways with the Lenco and Mk3. The DP80 has no cartridge mounted at the moment, so could not do it with "stylus drag" factor. Likewise, I don't have 3 tonearms on any one tt, so could not repeat that show either.

If the tt is not slowing due to stylus, based on Timeline, then one would also not expect to see it with the KAB, so I am in no position to argue your point that only the Timeline can reveal it. Nor do I doubt you, absent any experience of my own.
mab33
101 posts
 
Lew, how about the L-07D? Sorry if i missed it...
halcro's avatar
halcro
2,664 posts
 
I decided to try another method for the thread drive.
I connected a thread to the platter and one motor (green French silk).....whilst another thread altogether connecting the other motor to the platter (black French silk).
2 THREADS
Re-calibrated the motor-controller using the Timeline (needed to increase the speed due to stylus drag) and listened to the previously warbling flute on the Massenet Le Cid.
No warbling now :-)......and the Timeline is slightly more constant than with the rubber belt.
GREEN BELT
BLACK BELT
dover
2,187 posts
 
Halcro - looks like the 2 threads are touching. If so you might want to put a shim under one of the motors to lift it slightly and separate the threads. Would be interesting to try 1 motor/thread. Cheers.
More to discover