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Although both arms have identical spindle to pivot distance of 222 mm, their eff. lengths and overhang are different. The U3 has 233 mm & 11 mm overhang while the rb 300 has a 237 effective length and 15 mm overhang. I think the 4 mm difference in overhang will make you feel you are moving the cartridge more forward. Hope this helps.
Actually that does make sense to me about the difference of effective lengths and overhang. What John added further explains my problem. Which as it turns out is not a problem at all. I use the GeoDisc to get me in the ballpark and the db Systems grid to tweak it in. Those are the only two alignment tools I have. I used them on my old Thorens TD166 MkII, an old Lenco direct drive, a VPI HW19jr w/Audioquest PT7 tonearm and the Bluenote U3. The results were all about the same with the cart. sitting about mid-way to 3/4's in the headshell. As you can imagine I was a bit surprised to find the cart. almost all the way forward on the RB300 using this method of alignment. But, it is perfectly aligned in this position and even better it plays music. Thanks for all the info, Nick
> I think the 4 mm difference in overhang will make you feel you are moving the cartridge more forward.
It is actually a 6.3-mm difference in overhang when he uses a GeoDisc and a DB Systems protractor for alignment. These are both Baerwald protractors and require an overhang of 17.3-mm in the Rega tonearm. Therefore, the cartridge is truly moved forward in the headshell slots.
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