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Stylus Rake Angle

I am trying to set up my new VPI 3D arm as close to perfection as I can. On the Analog Planet, Michael Fremer gives one opinion, however, a different opinion was voiced by Harry at VPI, and Peter at Soundmith. I've been discussing this with them....Fremer says that SRA should be adjusted even if the back end of the arm is WAY high up as needed, whereas Harry, and Peter said to start with the arm in a horizontal position and move it slightly up and down to find the sweet spot. Peter said that my cartridge (Benz LPS) and some others have an additional facet in the diamond so bringing the arm up in back would be exaggerating the proper SRA. When I wrote back to Fremer, he answered with an insistance that he was correct. Does anyone want to add to the confusion??
stringreen

Showing 2 responses by ack

ack's avatar
ack
115 posts
 
What I would really like to see is a test record where each track of the same music be cut at different and documented SRA angles, plus a final track (of the same music) where the cutting SRA is constantly varied.

Then during playback and with our own SRA fixed, it should be interesting to try to hear whatever variations/distortions there may be. This will only serve to show what we should be listening for when playing back our regular records vis a vis our quest to set our SRA.
ack's avatar
ack
115 posts
 
@peterayer: adjusting VTA/SRA affects tracking force and other parameters, so what you are hearing is probably a combination of all these parameters, and perhaps more of the tracking force than the very tiny SRA/VTA adjustment you affected (if you do the math for your 12" arm, you will probably see that the difference is less than 1/4 of a degree for a 1mm vertical movement of the arm at the pivot point - perhaps significant, but I somehow doubt it).
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