Measuring TT Speed

There are a lot of variables with measuring speed and W&F. That’s not to say you shouldn’t try to measure it, but take the values with a grain of salt. As an example, I get the following for the same belt driven TT:


RPM App/World TT Database: 33.33 RPM, +0.00%, 0.07 W&F
WFGUI: 0.0199% RMS W&F
Analog Magik: 0.0443% AES W&F

@johnss:  Correct.  And that is what you get with AnalogMagik.  But still there are potential variables, including proper center hole on test LP, warp, etc.

@ lewm.  Some RPM apps are better than others.  The preferred ones have a way to be calibrated.

@ml8764ag
The RPM Turntable Speed Accuracy/World TT Database app for iPhone has a way to calibrate the app and then applies a multiplier for better precision.

The RPM Speed and Wow app and the RPM Calculator app both for android, which are popular, dont have any way to calibrate the app, last time I checked.

I have yet to see actual W&F measurements for a DD table that is any better than most other tables. Published W&F measurements from the manufacturer, sure.