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74.110.63.89
I have read through a number of threads, and do not find this information. I have spoken with the SOTA people, who did suggest that the Rega arms are mounted at a 222 mm span, as the Rega tables are. However, I have measured mine (early Comet III) with great care and it appears to be 219.5, which does correspond to the classic Braerwald allignment.
So this is the measure I am using to make my own protractors. Is my table an odd duck? Do all Comets and Moonbeams follow this geometry? Do the higher end tables?
Any light on this topic would be much appreciated.
Follow Ups:
The Rega alignment is way off any of the classic alignments giving an inner null of 57.2mm combined with an outer null of 120.4mm.
It looks to me like SOTA knew exactly what they were doing in resetting the pivot/spindle distance to 219.5mm. The offset shifts to 23.2degrees and the overhang is 17.48, so the cartridge SHOULD look skewed with respect to the headshell if that is what your templates are telling you.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
but I am wondering if all their tables are like this.
I will pick up a new protractor soon and try the DIN (57.5 mm) inner groove radius, so those numbers will be a bit different.
It looks like Rega were probably aiming for the Stevenson alignment, but got it wrong! If you had 222mm pivot/spindle, and made the overhang just over 0.4mm extra over the design value to make the effective length 237.41 mm they would have been there with a very good alignment.
If you play 7"s, or have many LPs that go right to the minimum radius then going for an inner null of 63.5mm will definitely be an advantage.
Regards Anthony
"Beauty is Truth, Truth Beauty.." Keats
You can't do better than an accurate measurement. Why worry any further?
Good luck,
John Elison
How many people with SOTA tables are out there using standard Rega protractors? I really don't know, and I would also like to know if mine is typical or an early production anomaly. Fair enough?
Well, if that's you goal, my advice would be get rid of your Sota and buy a turntable for which the manufacturer can tell you the tonearm mounting distance and alignment for all other turntables they've sold. Fair enough?
Fair? Yes. Enough? Not so much. I don't have the funds to swap out gear and much prefer to maintian what I have. I like the SOTA sound and design. It was, IMO, the best option in my price range when I purchased it many years ago.
I would like to send a custom protractor to a friend who is attempting to build a better system and is considering a Moonbeam. It would be nice to know the pivot to spindle spec. I can say of SOTA that they do publish other numbers on their tables.
BTW, the previous response was not intended to be confrontation, but rather truthful about my motivation.
Opus 33 1/3
Well, let's assume they have a proprietary alignment method, and would prefer that you send your table in to have a cartridge mounted. This could be part of a business strategy, not only to collect a fee for services, but because they do not trust the average consumer to align a cartridge properly and would prefer that their work always be presented in the best light. That is a whole bunch of assumptions, but might explain why they are never definitive in answering this question.
As silly as it is, it took me a while to figure out how to take an accurate measurement.
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