Thanks for correcting me on Stevenson

As I mentioned, I did not know the source of the constant in the Stevenson equation that I have and so was unsure that it was going to be right. I will dig into the literature and amend the Stevenson equations to adapt them to be flexible to variable groove radii. The spreadsheets I have, originally built by someone who has studied more about the mathematics of distortion than single person I know, have a constant in them for mounting distance for Stevenson and the null points generated off EL/OH/OA, while the other alignments have their null points generated off groove radii inputs.

As for the other part, it is not a misunderstanding on my part at all, and I thought that by qualifying my statement using the words "standard mounting distance according to an IEC template" (wherein I assumed standard IEC groove radii for a single set-it-and-leave-it alignment), and "practical" and "effective", I was not misrepresenting anything either. I assume you understood what I was trying to say.

In any case, I will stipulate again here that for any given record, if the alignment is set up to match the parameters of the modulated groove envelope, among the three main alignments (Baerwald/LofgrenA, Lofgren B, and Stevenson), the Baerwald/LofgrenA alignment will have the lowest peak tracking angle distortion [personally, I think "lowest overall distortion" is not necessarily accurate without further qualification - one that you have provided in a comparison between Lofgren A and B a few years ago (link below)].

As for the rest, once again you provide a very elegant and clear explanation of the issues and both I and future users of the VA archives thank you!

Concise explanation of Baerwald/LofgrenA and Lofgren B diffe (Open in New Window)

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Follow Ups Full Thread

Topic - REVIEW: UNI-Protractor UNI-Protractor Tone Arms - Stitch 07:20:07 04/30/11 (26)

* NEW * UNI-P2S Precise Adjustment Pivot to Spindle - Stitch 10:58:14 08/19/11 (0)

RE: REVIEW: UNI-Protractor UNI-Protractor Tone Arms - Mel 09:37:44 05/01/11 (15)

RE: REVIEW: UNI-Protractor UNI-Protractor Tone Arms - John Elison 11:54:53 05/01/11 (14)

RE: REVIEW: UNI-Protractor UNI-Protractor Tone Arms - Mel 13:28:10 05/01/11 (1)

RE: REVIEW: UNI-Protractor UNI-Protractor Tone Arms - John Elison 14:23:28 05/01/11 (0)

RE: I like the magnifier - user510 12:45:21 05/01/11 (11)

RE: I like the magnifier - John Elison 14:15:35 05/01/11 (10)

Precision of alignment - Paul Tobin 17:59:25 05/01/11 (2)

RE: Precision of alignment - p.taylor 00:06:14 05/02/11 (0)

RE: Precision of alignment - John Elison 23:25:15 05/01/11 (0)

For you, would there be any reason to prefer lower distortion OUTSIDE the nulls - travisty 17:13:19 05/01/11 (4)

RE: For you, would there be any reason to prefer lower distortion OUTSIDE the nulls - John Elison 18:31:15 05/01/11 (3)

I agree with Baerwald being mathematically attractive, but... - travisty 03:16:58 05/02/11 (2)

RE: I agree with Baerwald being mathematically attractive, but... - John Elison 10:56:44 05/02/11 (1)

Thanks for correcting me on Stevenson - travisty 17:35:45 05/02/11 (0)

RE: one thing about null points.... - user510 15:15:38 05/01/11 (1)

You can also move null-points without altering effective length or mounting distance by changing offset angle. /nt\ - John Elison 16:50:53 05/01/11 (0)

RE: REVIEW: UNI-Protractor UNI-Protractor Tone Arms - JCF 06:36:55 05/01/11 (0)

RE: REVIEW: UNI-Protractor UNI-Protractor Tone Arms - Halcroman 22:39:04 04/30/11 (0)

RE: REVIEW: UNI-Protractor UNI-Protractor Tone Arms - FolkFreak 13:50:47 04/30/11 (0)

nice post, thanks - beach cruiser 13:48:35 04/30/11 (0)

Kudos for your photography! - Muzikmike 10:40:10 04/30/11 (0)

RE: REVIEW: UNI-Protractor UNI-Protractor Tone Arms - bjh 09:48:36 04/30/11 (1)

He produced a limited edition about 20yrs ago called the Apolyt - travisty 10:02:08 04/30/11 (0)

Thanks for that informative review! - user510 09:05:37 04/30/11 (1)

The origin is apparently a 1984 article from German magazine 'Das Ohr' - travisty 09:59:32 04/30/11 (0)

RE: REVIEW: UNI-Protractor UNI-Protractor Tone Arms - mosin 08:41:51 04/30/11 (0)

Follow Ups

Thanks for correcting me on Stevenson - travisty 17:35:45 05/02/11 (0)

Thanks for correcting me on Stevenson

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