Question on FR 66s

Dear Raul,
CALCULATOR
Using the Vinyl Engine Calculator where you plug in the parameters (Eff Length, Off-set angle and Original Overhang) and then choose the new Overhang desired.........it calculates the NEW Pivot to Spindle distance and gives you all the new Null Points and consequent geometry as well as the new distortion figures.
As the stated Overhang for the FR-64s arm is 15mm......I don't know from whence your 14.7mm derives?
Perhaps you can communicate with Vinyl Engine and let me know the outcome so that I can clarify my understanding?

As for the MA-505s which has the same Overhang as the FR-66s.....and as far as I am aware.....there is no Off-set Angle built into the straight headshells (this is part of the S or P shaped tonearm itself).......can you please explain exactly how to use the Calculator as I must surely be missing something?

So, please don't delete my posts it is clear that you are hearing " different " things wrong or non-correct " things ", again way higher distortions.

As the "distortions you are listening to are infinitely greater than the zero distortions of a linear tracking arm.......how do you decide the limit of what distortions are allowable for the rest of us.....and at which point they are audible?

Raul, North of your border, a spoiled female would say, "Peel me a grape". There's a great jazz tune with that title, written by Dave Frischberg.

If one is going to use a protractor, is it a bad idea to use a "good" one? I think not. I did not use the word "expensive"; I used "good".

Suteetat,
In re-setting the FR-64s at a P to S distance of 231.5mm.......I discovered one cartridge/headshell combination which locates the screws at the furthest point of the headshell.
The Signet TK-7SU in the Yamamoto HS-1As wood shell is the only combination exhibiting this structure.
At this furthest point......it has perfect 'Dertonarm' geometry :-)

By the way, good luck with getting the overhang accuracy to 0.3mm, so as to distinguish between 14.7mm and 15mm, anyone. A little cantilever flexing will obliterate any such precision.

Halcro, thanks for your information. I mounted XV-1s yesterday and there was a few more mms wiggle room than Air Tight using Baerwald geometry on Feickert protractor.
So look like it was Air Tight and not something wrong with my arm or protractor as far as I could tell.

Feickert protractor is rather difficult to see especially if I have a light source on the side or the rear to help me see better. Light source is very useful for Air Tight and Koetsu especially but not as needful for Dynavector or Lyra. Surprisingly, I get a lot of glare of the black surface. Clearaudio silver finished is easier to see but Mint mirror surface is by far the best.

I saw Uni-tractor on acoustical system website. Is that the same protractor that Dertoarm made awhile back? There is an economical version call SMARTrack. Looks interesting!