Turnable database with TimeLine

I tried using my Fieldpiece digital tachometer again last night. I tried three l locations and placed the device on a stationary platform. In each test, the device read 33.XXX but the XXX had slightly different values at each location. These speed readings did not change when I introduced stylus drag. In fact, once the 33.439 or 33.352 was fixed I could not seem to get it to change value without turning the unit off and resetting it to zero. Nor could I get it to ever repeat a reading. Both the TimeLine and the KAB show the effects of stylus drag on my turntable. Perhaps the tachometer is just not sensitive enough to tiny changes.

I thought, this is a Database with Timeline and not a Database of "Turntable Owners Mystery Collection"?
To write somerhing useful for readers, the Kuzma "Reference" runs also with wrong Speed (too fast)....the search goes on :-)

Peterayer,
Your Dealer is wrong....

good morning Henry,
so you got one of the very early Timelines that flashes once per 1.8 seconds (33) ?
there were only a hand full of those that went out before the software was changed.
if so, let me know and i will get you a new chip.
Ron

As it turns out.....mine DOES have the new chip and flashes 6 times :-)

Actusreus,
I'm not sure I understand your question?
The turntable is not speeding up as the tonearm tracks toward the spindle....
I sense that many people without 'hands-on' experience with the Timeline may have difficulty understanding how it functions?
If the turntable is rotating at exactly the correct speed (33rpm or 45rpm).....the laser will 'hit' the wall at exactly the same spot every revolution.
Putting the Bluetak marker on the wall makes it easier to gauge the position of the 'hits' accurately.
If the turntable is running faster than 33.33rpm......the laser will hit the wall slightly further to the RIGHT of the marker every revolution so that the position will move further to the right at every revolution.
If the turntable is running slower than 33.33rpm (as is the case with the Raven)....the laser will hit the wall slightly further to the LEFT of the marker at every revolution and will move further to the left at every revolution.
With the Raven...you can see that the laser is moving approx 1mm to the left with every revolution....and it is consistent.
This probably equates to a speed of 33.31rpm instead of 33.33rpm.
When the arm is lifted at the end....you can see that the laser hits the wall mark at exactly the same spot at every revolution.
This indicates that the turntable is maintaining 33.33rpm without load.

But Syntax, is the Kuzma constantly too fast by a fixed amount while playing LPs, that is, regardless of stylus drag? If so, that is a fault remediable by an appropriate motor controller and not a black mark against the Kuzma.

Tony, I just cannot agree that a tachometer, no matter how good, is potentially superior to the Timeline for detecting micro-variations in speed, unless it would run off the rotation of the platter by a direct and perfectly non-compliant mechanical linkage, with no "belt creep". And then you'd have to stand there and watch it or run a recorder off of its output. In fact, Denon produced such a figure for use in their ad copy for the DP80; they show a very low level wiggle in an otherwise straight line, representing 33.33 rpm on the Y-axis, with time on the X-axis. But I doubt that the data come from a tach read-out. I don't recall how they derived it.

Peter and Henry, So if the single laser flashes six times per revolution, that would be about every 0.3 seconds. That's pretty near an instantaneous read-out. I wonder how it compares to the response time of a very good servo correction system. Maybe Richard knows.