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In Reply to: RE: 9" Jelco 750D tonearm alignment posted by John Elison on February 02, 2017 at 15:32:40
I just measured the actual spindle to pivot on my table. I know it is hard to get exact without a good tool, but I tried a few times with a ruler and I think that the center of the spindle to the center of the drop hole of the armboard is only 208 mm (despite that fact that a Linn Basik was previously mounted, which made me think the distance between the spindle to pivot on my table is 211mm). Does this change any of your recommendations? When I used your inputs (plus selecting a 208mm mounting distance) to generate the template, I got:
- Löfgren A
Inner groove radius = 60.325 (IEC)
Outer groove radius = 146.050 (DIN/IEC)
Pivot to spindle distance = 208.000
Inner null radius = 65.998
Outer null radius = 120.891
Effective length = 226.368
Overhang = 18.368
Offset angle = 24.381°
But according to the spec, Jelco 750's effective length is 229. Any suggestions or thoughts?
Follow Ups:
Listen to John's advice. He knows what he is talking about. I never trust my setup until he checks it.
-Wendell
Thanks, Wendell:
We missed you yesterday at Bill's. His system really sounds nice.
I hope to see you at our next listening session.
Best regards,
John Elison
Well, you can try installing the tonearm and aligning your DL-103 cartridge with a Löfgren A protractor designed for a mounting distance of 208-mm. If you can get the stylus to follow the arc by pushing the cartridge backward in the headshell slots then you are home free. Simply complete the alignment as I've described.
On the other hand, if the stylus won't follow the arc even when the cartridge is pushed all the way to the rear of the headshell slots, then you will have to elongate the mounting hole to increase mounting distance, preferably to 211-mm and use the appropriate arc protractor.
Good luck,
John Elison
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