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In Reply to: RE: REVIEW: VPI Industries Prime Turntables posted by HW on November 23, 2015 at 08:58:08:
> How many times do I have to say that the insanity in this business over arc protractors and alignment is total
> nonsense designed to sell arc protractors and make customers afraid of setting up there turntables.I don't believe I've ever heard you say that before. The last thing you said in this thread that I remember is:
> You can print out arc protractors for any spindle to pivot distance and get your alignment perfect that way.
Of course, this is only true when the tonearm is mounted at the proper distance from the spindle relative to its effective length.
Here is another statement that you wrote in this thread:
> The spindle to pivot distance is irrelevant to anyone who has actually set up a few thousand cartridges
I don't know where you get these ideas, but they demonstrate a serious lack of understanding regarding tonearm alignment geometry.
Let's talk about the tonearm parameters you published on your webpage for the JMW 10-3D tonearm. I believe this is the tonearm you provide with the Prime turntable. Correct me if I'm wrong.
The following three parameters define a unique null-point alignment geometry:
Pivot-to-spindle = 258-mm
Effective length = 273.4-mm
Offset angle = 19.98-degreesThe alignment null-points for the tonearm parameters above are:
Inner Null-Point = 70.1-mm
Outer Null-Point = 116.7-mmThis alignment reduces tracking error distortion in-between the null-points by allowing higher distortion to occur in the inner and outer groove areas. It is commonly know as Lofgren's "B" alignment as represented by the following graph.
Now, the protractor you provide with your Prime turntable is designed for a different null-point alignment. I measured the inner null-point directly from the protractor to be about 66-mm. Then, I calculated the outer null-point using Seb's Equation to be about 121-mm. I'm confused as to why you stipulate one alignment on your webpage and yet the protractor you provide with your Prime turntable is designed for a different alignment. Can you explain this discrepancy?
Thanks,
John Elison
Edits: 11/24/15
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Follow Ups
- RE: REVIEW: VPI Industries Prime Turntables - John Elison 12:10:01 11/24/15 (0)
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