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RE: This has been debated for a long time...

Posted by dave slagle (M) on August 29, 2016 at 10:19:02

In Reply to: This has been debated for a long time... posted by EdAInWestOC on August 29, 2016 at 06:58:00:

All of that useless stuff said, I find adjustable VTA/SRA very handy. As long as you do not over use the adjustment it is very handy to account for vinyl thickness and for various label's pressings.

I agree with the value of easily adjustable VTA and have heard drastic differences (microline tip) with minor adjustments. When the math perspective is thrown into it like Par does in the quote below it really gets interesting.

A record mat thickness variation of the order you refer to will not alter the replay SRA significantly. To put it in perspective, with a 9 inch arm a variation of 4mm at the pivot end will change SRA by 1 degree.

Obviously 4mm of VTA change is huge and to only effect a 1° change in SRA it makes me look for a better explanation than just record thickness.

Just because the math suggests that it is implausible that the SRA change of 1mm from 120g to 180g vinyl doesn't mean that differences are not heard. Maybe a 1° change in SRA is huge and something along the lines of 0.1° is audible with the more precise profiles and then suddenly everything makes sense again.

I go as far as avoiding the extreme profiles and prefer a line contact and am willing to leave say 10% of the music in the groove for not needed to adjust the VTA for every side. It is also important to understand that nothing states that two different 180 gram albums are cut with the same SRA so ultimately the concept of setting it for 92° can only get you close and the rest is up to your ears on a case by case situation.

dave

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