Re: Setting Cartridge alignment using a Two Point Protractor

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Posted by bkearns on February 7, 2001 at 19:47:07

In Reply to: Re: Setting Cartridge alignment using a Two Point Protractor posted by Helge Gundersen on February 7, 2001 at 15:39:50:

"I had some difficulty following you when you say that you can set cartridge angle at the inner point when the headshell slots aren't long enough. How can you know that the protractor is correctly rotated relative to the arm pivot when you don't get it right at both points and grids?"

You are correct, in that the protractor will be at the wrong angle, and this will result in the wrong effective length. But if you set the offset angle at the inner grid, then you can be sure that the tracking error is zero at that point. The effect of setting up a cartridge this way, will be to change the location of the outer null point.

For example, the slots in many arms don't go far enough forward to set alignment for null radii at 66.0mm and 120.9 mm. In that case you have to opt for a compromise. If you extend the cartridge fully forwards, and align on the inner grid, then the inner null radius will be at 66.0mm, and the outer null radius will be at some value less than 120.9 mm. This will give a slightly higher distortion at the edge of the record, but a lower distortion between the null radii and at the inner groove radius.

If you experiment with the values in John Elison's Spreadsheet, (available free at http://www.enjoythemusic.com) you can see the effect of this kind of change on tracking distortion.

Best regards,

Brian

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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

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)

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