10 Inch Tonearms

Dear @goofyfoot  : ""  I have a personal understanding as to whether or not different types of tone arms have chara....""

Which is your personal understanding that you did not show it yet? could you share with us?

Thank's in advance,
R.

Sorry R, you just have an axe to grind and I’m disinterested in going around in a cyclical argument about nothing.

goofygoot 12 ich tonearm is better for spu as you can’t add weight and if you look into SME 3009 R versus 3012 R - SME 3012 R is the better for application from eff mass point of view.
Thus in Japan a lot of 3010 R was sold as they do have small spaces at home and it’s convenient.
Tonearm has to be convenient to use, to adjust and easy to change cartridge.
Technical blah blah goes later on - perfect doesn't mean convenient to use.

I listen to other owned systems that have a different Tonearm Length in use to those that I own and use.
I cannot say at any time during a listening experience that there has shone out any noticeable differences, this is my experience when using recollections of Album's heard in various systems as the reference.            I do believe without any doubt, if differing Tonearm Geometries were set up on the same plinth a difference would be detected, but a proportion of the differences detected will quite easily be described as being down to the Design/Mechanics, Internal Wiring, and Cartridge being used for each device on demonstration. It would be a very difficult call to isolate any noticed differences to Tonearm Length Only.

I am fortunate to have reliable sources of information available to help guide me when I am being inquisitive and demonstrations offered from those contacted are usually great reinforcement to descriptions and reasoning on offer.
  
I had been in discussion with an Engineer who produces Tonearms and is the producer of my preferred and most used Tonearm.
I was looking to have a 12" Wand produced for this Tonearm.
This thought pattern was discouraged, as the benefits were not recognised by the Engineer, the R&D was suggested to be better used to produce improvements on Mechanical Interfaces on any given model rather than extend/shorten the Wand in the belief improvement would be found.
It was explained to me that the altering of the effective length of the Tonearm, would reduce/increase the angular error between null points, and creating these changes to null point error, was not a solution to improve a Tonearm that had been produced with other design issues needing to be overcome.
Keeping it in context, resistance offered by incorrect selection and routing methods for internal wand wire can degrade SQ on a Tonearm in a very detrimental way. 
I have had this A/B demonstrated and can stand sure in the recollections of the differences between the two methods selected for wiring a Tonearm.                                                                                                      Would the much improved impression offered by Tonearm B, be matched by Tonearm A, if a 12" Wand was placed onto Tonearm A . I did not experience the exchange of a Wand Length so the answer through drawing on experiences encountered is not available from myself. 

Most important factors:
Longer arm reduces tracking error.
Shorter arm easier to construct rigidly.
Shorter arm less mass.

The mechanical performance and resonance matching of arm and cartridge are far more important than a tiny reduction in tracking error.
If you don't like tracking error then get a parallel tracking arm.

Very little difference between 9" and 10" arms on any of these factors.
IMO not worth going for 12" but either a 9" or 10" is fine.