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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
halcro's avatar
halcro
2,664 posts
 
TIMELINE
Here is the video with the Timeline on the Transrotor Fat Bob which has a massive platter.
Watch how the Timeline immediately slows when the stylus is lowered?

The Timeline is also sold as a 'record weight'....although on the light side.
It is fairly easy to see if slippage is causing a problem by using the Timeline without a stylus playing firstly, then with a stylus playing on the mat and then without the mat or a different mat. It's not rocket science but this mentality of assuming the Timeline is somehow wrong and the turntable correct.......is the real problem here?
halcro's avatar
halcro
2,664 posts
 
Regardless of what the speed inaccuracy is due to.......one must find it and correct it as it is distortion of the analogue sine wave...pure and simple.
The Timeline will show it....and you must correct it. Not look for excuses :^)
ct0517's avatar
ct0517
2,041 posts
 
Hi Lew - regarding the Lenco l75. Can you please do the testing with and without the Walker motor controller. I realize setting the motor speed with the original slider is a bit of a pain. Am very interested in your impressions findings between the two.
Cheers
ct0517's avatar
ct0517
2,041 posts
 
Hi Henry
I just re-read what you wrote. I am assuming when you say

“ In this.....a belt or thread drive is at a severe disadvantage”

that this is your opinion only.

Have you heard a string drive TT that was designed by its manufacturer for the use of string ?

Cheers Chris
lewm
13,308 posts
 
Actually, since the Timeline is sitting on the spindle, and cannot fit completely over the spindle on a Lenco, which has a "fat"spindle, slippage of the LP would have no direct effect on the Timeline, in my particular report above. The Timeline is nowhere near to contacting the actual LP surface; it is kind of perched about 1 cm above it, which is as far down as it can go on the Lenco spindle.

Ct, Please say why you think there is anything of value to be learned by running without the Walker MC. I don't see the point, once I were to re-set the speed using the idler wheel adjustment. The Walker has no feedback mechanism; it only regenerates the AC used by the motor and controls motor speed by altering voltage. If anything, the WMC may reduce the torque of the single phase induction motor of the Lenco, because for this type of motor, voltage and torque are interdependent, within a limited range of adjustment.
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