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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
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
rauliruegas
13,129 posts
 
Dera Dgad: I think that Dowunder is right, try it and I'm sure everything will be fine.

Regards and enjoy the music.
Raul.
dgad OP
782 posts
 
Shane,

The arm is such a warped creation. It starts straight, then bends away from the center axis and then back in. Overhand is specified at 12 mm. So Now trying to add 4 arms I had to move everything around. It aint easy. But basically to establish 12mm overhang I don't have a tool for that. I use a ruler to establish the spindle to pivot distance of 295 mm. But since the cartridgge is a bit longer (52mm vs. the 50 mm specification from the arm manufacturer) I am thinking to increase the spindle to pivot distance to 297 mm. I hope it works. The Ikeda does not follow any of the known setup parameters hence all the questions. It is supposed to have only 1 null point if at all. Mind you, there is a thread on Vinyl Engine but that leaves me as confused. I don't have the Ortofon tool. I normally use the 66 null point and arrow to pivot for most of my arms. I also realize overhang is an extrapolation from how the cartridge lines up if the arm is linear. Only that way can the overhang of 12 mm be accomodated. So measuring overhang at the cartridge needle seems also impossible. The arm has a few bends so I need to run an imaginary line etc. to get it right.

Raul, what do you do for your FR arms.
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