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VTA adjustment for VPI 10.5 tonearm

I am trying to get the VTA adjustment right on my reference superscoutmaster signature/10.5/koetsu rosewood signature platinum combo and right now classic records 200g and 180g set at "85" position seem right with a slight boominess in the bass. With thinner records (140-150g), it seems I need to lower it to around the "50" position in order to not have a graininess in the sound. Is my thinking correct or is there some other adjustment like adjusting the gain (I am using 30ohm load on my pass labs xono phonostage)? Any input would be appreciated. Also, how do I know the correct distance to keep the rim drive from the platter and should it be in the silver ridge or should I adjust the minifeet to have the rim sitting on the black part of the platter?
powerdoctor
sonofjim
557 posts
 
Stringreen,
When running your table without the anti-scate do you use the wire twist or just nothing? I know in the past you have felt that the wire will fatigue and the twist will loose it's effectiveness. I'm still trying to talk myself out of the anti-scate off and on but currently am still using it at about as light a weight as it will operate without the lever falling over as the stylus reaches the center of the disc.
stringreen's avatar
stringreen
6,443 posts
 
Hi Sonofjim... I use nothing for anti-skate at all...not even the Twist (Chubby Checker notwithstanding). I know that VPI arms can be a pain to adjust, but if you are inquisitive..just detach your monofilament to detect any difference. If you hear no difference why use it?? Then remove it from the arm, listen carefully, and I think you will hear a cleaner, clearer presentation.
colinb
2 posts
 
As anyone out there tried to fit a VPI 10.5i to an Avid deck? I am just doing this and at the powest VTA setting the arm is still quite high at the back thus not being able to start with a level setting
johnbrown
195 posts
 
Disagree on the 'parallel arm tube' method.

Ultimately, SRA, not VTA, is the final arbiter for tracking a groove with a stylus, and many factors other than the arm tube influence SRA (angle that the cantilever exits the cart body, cantilever compliance and length, stylus shape, attachment of stylus to cant, etc.) I use a 30x magnifier, and my 'Littlelight' as a backlight, to initially set the SRA as closely as I can to 0 degrees (at 90 degrees to the record). I usually find that slightly raising the back of the arm provides the best sound, but my VPI 12.5 arm (like your 10.5) makes it easy to document repeatable settings.

I do agree, though, about making your settings on an 'average' thickness LP, finding a sweet spot, and then just playing some music-setting VTA for all records is way, way beyond my fussiness threshold, and borders on putting a premium on hi-fi effects, not on the music. IMO, of course.
colinb
2 posts
 
Perhaps I have not quite explained my problem correctly.I am glad you know what I am trying to do, but what is happening is that on my lowest setting the back of my arm is SO much higher than the tip I think I am missing out on my optimum setting which could be somewhere between here and level, I totally agree with your thoughts but I am so far away from the 90degs to the record
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