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
....It's a complex and zen system at the same time.

For a lot of Audiophiles everything is more or less a fascinating wonder when a light stars to shine and something is beginning to move. A turntable needs the right speed, knowledge to make the area of the needle silent and a solution to remove the energy from the tracking. All together in the best possible way (Engineering).
The Story is simple. But not for everyone :-)
"A turntable needs the right speed, knowledge to make the area of the needle silent and a solution to remove the energy from the tracking." Amen. Very Zen.
No doubt repeating a point someone else has made.
If the speed is off, the pitch is off, a cardinal sin for me.

Interesting story which I shared years ago.
I was in Chicago at the CES...circa 1984. I had lobbied Magnepan for their line a lot. A LOT, LOT, LOT. To their credit THIEL beseeched me to carry Maggies.
At the CES in Chicago that year, I went in to the Magnepan booth...they were, as I recall playing the MG III's.
Jim Winey asked me to 'have a seat, listen and tell me what you think.'
I had told him on entering that I'd been trying to get his line to no avail...like a Zen Master, he listened and nodded patiently...'Sit, Listen'.

After I listened to a cut I knew, from 'Jazz at the Pawnshop', I stood.
Mr. Winey said, 'What do you think?'
I said, 'It sounds great, just one small issue.'
'Yes?'
'Your turntable is turning too fast, the pitch is sharp.'
He only nodded.
A week later, I got a phone call from their then Director of Sales Dave Carambula (memory)...
'If you still want the line, we'll ship tomorrow.'
They did.
When Dave showed up, I introduced my Wife...he said, I don't remember her, but we remembered you...especially Mr. Winey remembered.'
'Oh?'
'Yes...he told me, give that man our line, anybody who notices the pitch differential deserves to have us in his store.'
He turned to my wife, 'Yes, your husband's the one who told us that our turntable was set up wrong.'
That is how I ended up with the Magnepan line.

Funny how the best stories are always the true stories.

Larry
The argument between measured performance and audible performance must be as old as our hobby. Both sides of that coin are being described here regarding speed.

I don't have any musical training and I expect my perception of timing (tempo) is better than my sense of pitch, which is certainly not absolute. A few years ago when I bought my SP-10 Mk 2A I had a tech friend go through all the calibrations described in the Service Manual. The strobe showed steady speed but when I listened to any recording with a sustained piano cord I could clearly hear a wavering. My friend could not find a correction for that so I took it to a professional tech. With the aid of one of my observed recordings he was able to find another adjustment that eliminated the wavering. After that there was not observable difference in the strobe but there certainly was an audible difference.

Thus I don't feel any need to investigate this Timeline device.