RPM - Turntable Speed Accuracy

Got a new turntable, and wanted to save it to my history and share it to the database. But for some reason, my app no longer allows me to save new turntable data. I deleted a bunch of the duplicates I had submitted thinking I might’ve reached my limit, but that’s not the case, because even with just a few measurements in my history, it no longer allows me to save new measurements. I’m sure it’s just a short term bug.

This app is pretty good, as far as I can tell. It’s really easy to use and doesn’t require as much effort as a stroboscope; just put your phone on a roll of tape above your turntable’s spindle and go. However, it’s extremely limited on the free version, with only 10 tests for 33 RPM and, confusingly, no way to calibrate the app. Like another reviewer said, 10 tests is just enough to potentially get you into trouble if you don’t know what you’re doing. I have no qualms with paying for a good app, but 15 dollars for the full version is way too much for an app I’d rarely use. If you aren’t constantly adjusting the speed on turntables, just print out a stroboscope disk and get a stroboscope app. It takes a little more effort but it’s completely free.

This app is good, although I highly recommend running in calibration mode first. Before I did that on a rega rp3, it was reading way faster than the strobe disk, but once auto calibrated it was quite close. This is with an iPhone XR. I’m still a bit confused about wow and flutter and the circular trace it does. My sense is that it it showing unevenness in rotation and platter flatness, but for wow and flutter the relevant thing is what is happening where the needle touches the record. I’m, not sure if this w&F measure is comparable to what other folks measure. I did take heart, though, that my W&F readings were generally around .2, which seems to be about what most turntables in the database show...but I have no idea if other TT measurement systems would come up with the same number.