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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??
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rauliruegas
13,103 posts
 
Dear Lewm: ++++ " then it seems to me that small errors in overhang (say +/-1.0mm, but I would have to do the geometry before settling on that margin) can be tolerated. " ++++

as I posted we have to choose our trade offs, this is each one privilege. For you 1.0mm could be tolerated and maybe for me even 1.5 mm too and as JG posted there will be an offset angle/linear ( and the like. )deviation too.

Imperfect world!

Regards and enjoy the music,
R.

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rauliruegas
13,103 posts
 
Of course that we can take the attitude to don't care about at all and only listen. Nothing wrong with that.

R.
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rauliruegas
13,103 posts
 
Dear friends: IMHO speculations and theory is something that we have to prove.

Any one of you ( with Barwald or Löfgren B today cartridge/tonearm alignment. ) can make the next test:

simple make a change ( new set up ) to either of those alignments where you just need to make a change in overhang ( offset angle is negligible. Overhang less than 0.4mm. ) and listen carefully on both set ups with very good ( in deep ) know LP tracks at three LP surface positions: between null points, outer grooves ( out side null point. ) and inner grooves ( outside null point. ) .

You will now and understand why Löfgren calculated ( 50+ years ago. ) two alignment solutions: A ( Baerwald ) and B. Of course you can read his white papers somewhere in VE.

If you can try to find out tracks with high bass content ( more easy ) and listen the transient response on both set ups looking for differences and then share with us your experiences.

Regrads and enjoy the music,
R.
csontos
1,311 posts
 
I'm still not convinced that SRA should match VTA(cutting stylus) necessarily. What shape is the cutting stylus vs. the many different playback styli? How many different cutting stylus shapes are there?
csontos
1,311 posts
 
Here's an interesting and somewhat revealing take on Micheal Fremer's TT set up technique.

http://m.youtube.com/watch?v=CJ7nAdITdk
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