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In Reply to: RE: REVIEW: VPI Industries Prime Turntables posted by bill_stevenson@bellsouth.net on November 28, 2015 at 12:36:59
You confirm that the speed you measured is less than 1/10 of 1% above setpoint.I'd say that is well within the margin of error both of your measuring equipment and technique.
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.. either that or my reading comprehension is, but looks like he's reporting an error of about .33/33.33, which is 1%.
Still, doesn't seem that big a deal, and without knowing the power line frequency at the time, hard to make an assessment about whether it's an issue. The line frequency does vary, it is only specified as an average accuracy. And negative feedback control systems sometimes degrade the sound of audio components as well, so speed stability and accuracy alone may not be enough to determine the best sound. There have always been turntable designers that felt plugging the motor directly into the power line gave the best sound, and designers that felt it best to regenerate the motor drive signals.
".. either that or my reading comprehension is, but looks like he's reporting an error of about .33/33.33, which is 1%"
Let me prove it... 33.6(avg. high to low)-33.33=0.27.........
0.27/33.33=0.0081 so I'd say less than 1/10 of 1% look go to you?
"The line frequency does vary, it is only specified as an average accuracy"
Line frequency does not vary. I've seen a fusible link blow up because frequency was 2deg. out of phase while syncing a power house (2200KW)to the grid. Talk about a big bang! All turbines in the US run at a 60 HTZ frequency. The grid is carefully monitored to maintain that frequency.
not that it really matters
Edits: 11/29/15
it's .0081
.1= tenths or 1%
.01=hundredths or 1/10 of 1%
.001=thousands or 1/100 of 1%
Let me try...
1%=1 per hundred (thus cent) or 1/100 or 0.01; 1/10 of that is 0.001.
So .0081 is 0.8%, or just less than 1%.
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