• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Platter spins at 33.4

truckrglenn

truckrglenn

Lost
Decided to test the platter speed on my Yamaha PX-2. Using the app RPM Calculator on my phone the Platter measures 33.4 for half a spin and 33.5 for the other half.

The Quartz Locked lights up for the correct speed. Records sound great. Should I be concerned or is this just a fluctuations caused but using an app on my phone?
 
Register to hide this ad
It's hard to tell what the tolerances would be for a reading on a cell phone app. I would only use such tools to get a rough guess for RPM, certainly nothing with a high level of precision.
 
Considering the fact that most electronic components are +/- 10% or even 20% in a lot of cases--this being both your phone (including the accelerometer) and your TT, a 0.1 rpm variation from 33.3 rpm is absolutely miniscule in the grand scheme of things--I wouldn't worry about it. Then factor in the % tolerances of the cutting and stamping gear used to produce the record and it makes it even less relevant/significant. Quit chasing the dragon--let him go this time.
 
savatage1973 said:
Considering the fact that most electronic components are +/- 10% or even 20% in a lot of cases--this being both your phone (including the accelerometer) and your TT, a 0.1 rpm variation from 33.3 rpm is absolutely miniscule in the grand scheme of things--I wouldn't worry about it. Then factor in the % tolerances of the cutting and stamping gear used to produce the record and it makes it even less relevant/significant. Quit chasing the dragon--let him go this time.
Click to expand...

Exactly.
A lot of people is obsessed with turntable specs where most records are not even centered and has a W&F more than 1%.
 
I use a digital rpm gauge. My Rega spins a tad over 34 rpm and same for my air table. Who knows if its correct...it sounds better to my ears then when the gauge reads 33.4 :music:
 
I've got the same ap. Three TT's run at 33.3 +/- .1rpm. However, one TT (YP-701) runs at 34.3rpm. I read in another thread, dealing with RPM measuring devices, that some manufacturers actually raise the speed slightly, to increase the fidelity or dynamics or what ever. Anyway, my YP-701 is my fav TT.
 
kcblair said:
I've got the same ap. Three TT's run at 33.3 +/- .1rpm. However, one TT (YP-701) runs at 34.3rpm. I read in another thread, dealing with RPM measuring devices, that some manufacturers actually raise the speed slightly, to increase the fidelity or dynamics or what ever. Anyway, my YP-701 is my fav TT.
Click to expand...

This is probably the case...thinking back I have always noticed the Rega sounded a little faster when switching between it and say an AR table I may have on my bench.

In all honesty it does sound better to my ears at 34 rpm.
 
My YP-701, being the better (build quality/specs) of my TT's, is my serious listening table. So there might be something there with the slight increase in speed.
 
Keep in mind... Kind of Blue sounded GREAT and received accolades yet side 1 was 'off speed' - who knew?
 
truckrglenn said:
Decided to test the platter speed on my Yamaha PX-2. Using the app RPM Calculator on my phone the Platter measures 33.4 for half a spin and 33.5 for the other half.

The Quartz Locked lights up for the correct speed. Records sound great. Should I be concerned or is this just a fluctuations caused but using an app on my phone?
Click to expand...

I wouldn't sweat it.
 
Thanks again everyone for your feedback. Years ago when I bought my first PX-3 I just knew that it played the 1812 without skipping. Truthfully, that's why I bought it.
 
WARNING: after reading this thread I decided to download an RPM app. 33.3, spot on, 45, a tad too slow.

78rpm almost killed my stylus and my phone! It just flung off and missed my cart by half a centimeter!!

Now I know I don't want to look stupid, but I thought I mention it anyway. Hopefully I can prevent some broken phones and carts!
 
My office TT

Reloop RP-7000 MK2

RPM.png
 
We're five techs at the lab - six including the boss. We've got 4 androids and 2 iPhones. No two phones ever display the same RPM when we test a TT we've fixed. I've got another iPhone at home. Nope! It never agrees with my Galaxy.
 
You must log in or register to reply here.
Back
Top Bottom