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VPI SDS Calibration Gurus?

Hi all, Having recently acquired a new SDS, I had noted that upon power-on of my SDS, it reads 72v. Upon power on of my HW-19Jr with MK-IV Platter, it will ramp up to 115v, but then only at first ramped down to 84v.

I searched the Audio asylum, and found that there is a calibration mode for the SDS. Nothing of this is mentioned in my manual. I toyed with it a bit, and did eventually set the calibration of voltage to then again ramp down to 72v after platter reaches speed. (perfect speed for me with stylus drag included is 60.11hz with the KAB Strobe) Would this be the optimal voltage setting for me? (72v)

Can someone please comment, and perhaps please post the calibration instructions here for me? Thanks in advance, Mark
markd51
creativepart's avatar
creativepart
154 posts
 
My SDS cycles down to 72 volts for playing. I've also got the KAB strobe and the TT's speed is rock steady while playing.

Hey, email VPI about their word files on their website. I sent them an email about this a couple of months ago. I told them I'm a web developer and no one should be using Word files on their website to distribute documents. And that they should convert all of the word docs to PDF format. I even created a PDF of their price list for them and sent it to them.

I got back a snotty "go away" email from Sheila saying that they knew more about the web than I did and that everyone LOVES their website and they didn't need any suggestions. Pretty much a "piss off" email and all I was trying to do was help them.
markd51 OP
763 posts
 
James/All
Just a quick update, that after dropping the ramp down voltage from 84v to 72v, what I had noticed, was that again, the Platter was running just a slight hair slow again, and needed to compensate, by raising the frequency from the originally needed 60.11hz, to 60.17hz.

From what I can see, by careful examination again with the KAV Strobe Disc-Strobe Light, all appears just fine, with the speed staying rock stable even with stylus in play, and the sound which I sampled last night for a good hour, or so, sounds very good indeed.

Soon, I'm about due again to yank the Mk-IV Platter-Bearing for some fresh oil-lube, and I suspect this might again mean a minor adjustment of the SDS's frequency to compensate. Mark
jameswei
883 posts
 
Sounds like you've got it!
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