Polaris Plus

212.186.255.4

Posted by Helge Gundersen on February 8, 2001 at 14:25:54

In Reply to: To be shocked may be to overdo it :-) (more) posted by Helge Gundersen on February 8, 2001 at 05:30:50:

Now I have used the spreadsheet... Following is a table for distortion based on a calculator made by Brian Kearns. See previous message.

First is distortion at 62 mm (arbitrarily chosen to represent the inner grooves), then maximum distortion between the null points, then distortion at the outermost groove (146 mm).

1. Hole A + old sight line: 0.19, 0.66, 0.66
2. Holes A + B + new line: 0.19, 0.67, 0.64
3. Hole B + old line: 0.01, 0.74, 0.66
4. "Standard" 66 + 120.9 mm: 0.4, 0.61, 0.62
5. Hi-Fi News: 0.29, 0.63, 0.65
6. Enjoy the Music: 0.89, 0.6, 0.45

Following the instructions (no. 1) will yield a slightly lower distortion between the null points than drawing a new sight line right between the spindle holes (no. 2). On the other hand, distortion in the outer groove (146 mm) will be slightly higher. Many records start around 145 mm, and the middle grooves are more important than the outer grooves (due to more compressed undulations on the groove walls), so I'd say that following the instructions is the best. This
alignment is also okay, I guess, although the outer null point should ideally be slightly further inwards, at least at 119.6 or 119.7 mm. Option no. 3 (using the sight line with hole C instead of hole A) gives a far too high distortion on the middle grooves.

It can also be seen that the alignment with null points of 66 and 120.9 gives a higher distortion on the inner grooves, but lower on the middle grooves. I have also joined the values for the Hi-Fi News protractor (not at all bad, IMO) and the Enjoy the Music-protractor (favours the outer grooves!).

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Follow Ups Full Thread

Topic - Setting Cartridge alignment using a Two Point Protractor - bkearns 03:58:40 02/07/01 (19)

any interest in my printable templates? - mkjnovak 12:27:42 02/09/01 (0)

Re: Setting Cartridge alignment using a Two Point Protractor - Helge Gundersen 15:39:50 02/07/01 (2)

Re: Setting Cartridge alignment using a Two Point Protractor - bkearns 19:47:07 02/07/01 (1)

Ah, I see [nt] - Helge Gundersen 03:55:44 02/08/01 (0)

Re: Setting Cartridge alignment using a Two Point Protractor - Mel 09:25:52 02/07/01 (19)

Re: Setting Cartridge alignment using a Two Point Protractor - bkearns 19:14:32 02/07/01 (5)

Re: Setting Cartridge alignment using a Two Point Protractor - Mel 19:27:12 02/07/01 (4)

Re: That is not what I meant. - bkearns 20:44:34 02/07/01 (3)

Re: That is not what I meant. - garth 03:34:22 02/08/01 (1)

Re: That is not what I meant. - bkearns 20:11:52 02/08/01 (0)

Re: That is not what I meant. - Mel 23:40:54 02/07/01 (0)

Re: Setting Cartridge alignment using a Two Point Protractor - Helge Gundersen 16:12:22 02/07/01 (8)

Are you serious??? - Mr. Walker 16:41:48 02/07/01 (7)

To be shocked may be to overdo it :-) (more) - Helge Gundersen 05:30:50 02/08/01 (4)

Re: To be shocked may be to overdo it :-) (more) - Mr. Walker 04:28:33 02/09/01 (1)

63.3, yes! (Which, of course, makes alt. 3 in my post below wrong.) [nt] - Helge Gundersen 14:09:37 02/09/01 (0)

Polaris Plus - Helge Gundersen 14:25:54 02/08/01 (0)

Re: Setting Cartridge alignment using a Two Point Protractor - garth 10:48:40 02/07/01 (1)

Re: Setting Cartridge alignment using a Two Point Protractor - Mel 13:13:54 02/07/01 (0)

Follow Ups

Polaris Plus - Helge Gundersen 14:25:54 02/08/01 (0)

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