No, the manual is correct.... for use with this ...

Posted by Garth (A) on September 10, 2006 at 04:10:09

In Reply to: Re: According to the manual .... posted by Sea Monster on September 10, 2006 at 03:38:25:

and the problem most likely lies in the fact you are:

A) not using an Ikeda cartridge
B) using a different headshell

As you noted most other non-Ikeda cartridges donot fit inthe Ikeda headshell which was designed for an Ikeda cartridge as shown above. The Ikeda cartridges have a vertical cantilever which extends downwards at about the position of the mounting holes. A normal cartridge has the stylus about 9-10mm in front of the mounting holes.

So when you use a different headshell, which is probably longer than the Ikeda, and a "normal" cartridge the effective length has be increased. How much? Probably 10mm or more depending on where the cartridge is located in the headshell.

As I mentioned earlier I encountered the same problem as did Allan below.

The manual is correct only if using all original Ikeda parts, as it was intended.

Yes, I suspect you will have to move the mounting point outwards. How much? Measure the distance from the pivot point of the tonearm to a point midway in the slots in the headshell. Add 10mm for the cartridge and that will give you the new effective length.

Then you can calculate the new mounting distance using the null points you wish to use to align the cartridge although I am pretty sure the offset angle of the headshell (fixed in this case by the bend in the armtube) is assuming Stevenson null points and the original 307mm effective length.

So unfortunately you will probably end up with an alignment which does not match any of the physical parameters of the arm.

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Follow Ups Full Thread

Topic - A different protractor for 12" arm? - Sea Monster 10:27:39 09/09/06 (12)

I don't know if you heard this caution before, but... - NewStevo 08:42:16 09/10/06 (0)

Same protractor for all arm lengths. The problem is ... - Garth 12:00:11 09/09/06 (10)

Re: Same protractor for all arm lengths. The problem is ... - Sea Monster 18:39:18 09/09/06 (7)

According to the manual .... - Garth 01:27:33 09/10/06 (6)

Re: According to the manual .... - Sea Monster 03:38:25 09/10/06 (5)

No, the manual is correct.... for use with this ... - Garth 04:10:09 09/10/06 (4)

The measurement is in fact from stylus tip to headshell base - Sea Monster 06:25:40 09/10/06 (3)

What does stylus tip to headshell base mean? - Garth 06:36:22 09/10/06 (2)

Re: What does stylus tip to headshell base mean? - Sea Monster 05:09:59 09/11/06 (1)

Less elegant than what? - Garth 05:19:29 09/11/06 (0)

I use a 12" Ikeda with an Ortofon SPU - Allan Songer 14:27:29 09/09/06 (1)

The Ortofon SPU changed the effective length vs. the original headshell. - Garth 01:57:12 09/10/06 (0)

Follow Ups

No, the manual is correct.... for use with this ... - Garth 04:10:09 09/10/06 (4)

The measurement is in fact from stylus tip to headshell base - Sea Monster 06:25:40 09/10/06 (3)

What does stylus tip to headshell base mean? - Garth 06:36:22 09/10/06 (2)

Re: What does stylus tip to headshell base mean? - Sea Monster 05:09:59 09/11/06 (1)

Less elegant than what? - Garth 05:19:29 09/11/06 (0)

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