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Setup of Ortofon SPU Royal GM II in Ikeda 407

I would love some feedback on how people set up their SPUs in an Ikeda 407. The Ikeda has a few different setup parameters. The main one is to use 307mm from pivot to spindle and then just position the cartridge at the 50MM point in the headshell (measured from stylus to end of headshell) to get it right. But this does not conform to any of the known null points and has me confused. The SPU is 51 MM in length and going beyond in length is much worse than going less in length. Anyone w. experience to chime in would be appreciated. Remember the SPU Royal GM has the cartridge permanently fixed in the headshell. The only adjustment I can make is in the positon of the tonearm base.
dgad

Showing 2 responses by downunder

downunder
1,329 posts
 
Darren

From 2juki's web site for the 407.
" Overall length 388mm, Effective length 307mm Overhang 12mm"

Would that mean all you need to do is is measure pivot to spindle of 295mm, then add the 12mm for the stylus position??

This is how I set up my Ortofon 12 inch arm. Put the Ortofon ruler on the table and place the stylus on the 326mm (15mm after the pivot to spindle) effective length spot by moving the armboard. And you know that is easy with the Raven armboard.

If I am wrong, please someone let me know.

cheers
downunder
1,329 posts
 
Darren

The ortofon tool is only a plastic ruler with a drilled hole in the middle at the pivot to spindle point. You then just put the ruler over the spindle and measure the the correct mounting distance.

There is then a line at the 15mm mark which marks the effective length. You move the the armboard so that the SPU stylus sits on that line right next to the spindle.

That is it, as you know you can't change the alignment on the SPU due to its fixed headshell.

If you can drill a whole and mark the effective length on your ruler, that should do the trick.

let me know if you want me to email you a picture of the Ortofon ruler in action

cheers
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