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In Reply to: RE: REVIEW: VPI Industries Prime Turntables posted by bill_stevenson@bellsouth.net on November 20, 2015 at 18:03:47
Congrats on you acquisition.
"I have the Eagle/roadrunner package, but this write up did not include it"
I've been curious about the speed accuarcy of my Classic. Since it's the latest model(DC motor) the RR can't be used.
The Prime seems to be the "sweet spot" of the VPI line. It has my attention as the replacement of the Classic.
Follow Ups:
You have an AC motor in your Classic, we have never used a DC motor. What you see is a power supply to feed the small version if the SDS built into your table, it is a sine wage regenerator that feeds the motor a perfect 60HZ sine wave.
We used that for about one year in Classic 1's and Travelers.
HW
Interesting. So the SDS isn't really necessary on some of the Classic 1's and Travelers?
aahh...so the DC signal is fed to an inverter circuit to an AC motor. Understood
Same thing going on with my main power feeding the gear-PSA Power Plant.
My belief was reinforced by the dealer while inquiring about the SDS.
Thanks for the clarification.
Are you certain the motor is DC? Harry has stated many times that he feels that AC is the way to go. Every other VPI that I know of has used an AC motor.
Of course it wouldn't be the first time VPI has tried different technologies but this is the first I've heard of a DC motor on a VPI.
the latest version of the Classic I has a DC motor.All earlier versions indeed, have the AC motor. Perhaps the only non USA part.
I contacted VPI, if I MUST have dead accurate speed, they will install the 300 RPM AC motor/pulley.
That is a DC supply for their built in controller. The motor in your Classic is actually a 24V AC synchronous motor. The table has its own AC regenerator, but with fixed frequency output. As John said, you can use the RoadRunner with the table, but you would have to bypass the internal controller or replace the motor with the standard 120VAC synch motor if you wanted to use the Eagle controller.
You can use the RoadRunner tachometer with your turntable regardless of whether your motor is AC or DC. The RoadRunner simply measures the rotational speed of your platter.
Do you have a platter speed adjustment on your turntable? If so, the RoadRunner will allow you to achieve an accurate speed setting. I use the RoadRunner on my turntable without the Eagle because my turntable has its own regenerative power supply.
Good luck,
John Elison
Yes, I'm afraid If I buy the tach, I will find out the table speed is off .000? and I will obsess on it not being accurate even though I can't really hear it!
The pulley steps are suppsedly different diameter, so there is the a little wiggle room.
I do notice slight pitch variations when playing my guitar along with tunes. I suppose we could nit pik and question if I'm tuned to precise A440?
I think you might be surprised how far off the speed might be and I'll bet you could hear the difference. The OP stated that his Prime was running 33.595-33.605 which is ~0.8% fast, which to most people is audible.
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