Turntable speed accuracy

Dover, good suggestion. I have a small, round bastard that should do the trick. I might give that a try.

The Allnic SpeedNic works pretty well. I have put two images on my page (last two images when scrolling down)

best @ fun only

My KAB strobe works pretty well also.
With it....the Raven keeps perfect speed.
If you want to be happy.....use a strobe.
If you want the truth.....use the Timeline :^)

Halcro put it in the most precisely manner. The Timeline may be frustrating in it's accuracy, but then it is not the Timeline's fault. Very interesting too, to watch the laser beam over the whole record side ( record it with a camera - it is too boring looking there all the time).
On many turntables one may notice shifting back and forth and correction with controlled motors during heavily modulated passages.
A nice lesson in stylus drag and it's not linear nature.

I filed the hole in my stereo test record. I improved the runout a bit. According to the iPhone app, I now have the raw Wow down to +/-0.16%. The filtered didn't change, -0.01%/+0.02%. The total spread within the published specs for my tt. With a little more filing of the center hole and more work/patient effort to center the record on the platter, I could improve the raw values even more. I have a feeling that I will be bringing a dial indicator home from the machine shop at work to measure record runout with extreme precision. I will likely be filing the holes on my records now to perfectly center them. My neurosis is ratcheting up a level, I think.
Anyway, this app is nice, you can play the test records 3150Hz track at 45rpm and this app will detect the higher frequency and tracks the speed at 45rpm automatically. I must agree having seen it live with this app. Having the motor via a belt separate from the floating chassis/platter is a deficit. The slightest vibration/movement of the floating chassis causes a speed error. It is a small error, but still there.