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In Reply to: RE: Phoenix Engineering Falcon PSU (similar to VPI SDS) review video posted by Drew769 on July 28, 2014 at 22:03:38
If lowering the voltage is beneficial once start up rotation has been acheived, why dont the manufacturers simply implement a low voltage design that requires the user to establish rotation by spinning the platter by hand? Hasnt there been tables on the market where this was required? If so what might the drawback be?
Follow Ups:
Really, 99% of my customers would send the table back if it didn't start when they pushed the button! BTW, it is not really safe to sell things in the US without an on-off switch and a fuse!!
Nottingham does that ; you need to spin the platter to get it going, no power switch.
VPI drops the voltage down after start up, too, IIRC.
Linn LP-12 runs its AC motor at about 86 VAC, with the Valhalla mod, IIRC.
I always spin the platter on my Sota Millennia when starting. I just grab the reflex clamp and give a spin as I press the start button in order to take some stress off the belt.
Best regards,
John Elison
I get my Sota platter spinning up to "approximate' speed using the reflex clamp, before I hit the go button. But what ever.
My purpose for helping the platter get spinning is to take tension off the belt. The motor in my Millennia exhibits significant drag when it is not running. Therefore, if I spin the platter without pressing the start button simultaneously, the belt is stressed in the reverse direction. The purpose of my action is to reduce stress and strain in the belt. I don't care anything about the motor because it is very rugged and powerful. Even if I don't spin the platter manually, the motor will bring the 15-pound platter up to full speed in one revolution. That is pretty good for a platter with most of its mass in a lead peripheral ring.
Best regards,
John Elison
Like I said, what ever.
The reflex clamp is great for giving it a start, isn't it.
Opus 33 1/3
Yes John, that is how it should be made, push the button and spin the platter. You need an on-off switch!!!! Sota knows that.
I think the VPI SDS performs that function for VPI tables. I'm not sure it reduces voltage on its own. I have found a significant improvement in Aries performance using a simple variac to reduce voltage to 60v after the platter is up to speed on start-up.
The SDS drops the voltage to 72V or higher in increments of 6V after platter has stabilized and the power can be reduced.
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