Question on FR 66s

Sorry guys,
I had forgotten that the time Lew refers to when I did indeed seek to interchange headshells between my two FR-66s arms, the FR-64s arm and the Micro Seiki MA-505s which was nearly two years ago I think?.....
The MA-505s was no problem because it's overhang is the same as the FR-66s.....however the FR-64s has an overhang of 12mm as opposed to the 15mm for the others.
So to correct for that......I reset my P to S to 233mm for the 64s.
And yes......I know that the Av and Max distortion levels go up as a result.
I think now that I will select about 5 or 6 cartridges and specifically align them for the FR-64s set at 231.5mm.
I've had to do that already for the SAEC WE-8000/ST so we shall see......?
I also miscalculated my cartridge storage facilities.......
The total is 38......not 48 :-)

Tempus fugit.
Thanks, Henry, for the clarification.

Dear Halcro: Something is wrong in your whole tonearm/cartridge set ups:

FR choosed Stevenson ( IEC ) alignment for the tonearms mounting specs ( we can choose Löfgren A or B if we want to test in between. ) and that's why the 66 overhang is 12 against the 64 that's 15mm.

Now, following Stevenson and following what you did to change the 230 PtS distance to 233 for " compensate " and can swap cartridges between 66 and 64 is a misunderstood just does not works because if you change to 233 the correct 64 overhang is 14.7mm not the same as the 66 and with a different offset angle/linear offset too and something similar occur with the 505 too.

So that's not only an issue of way higher distortion but a plain misunderstood how to handle how works those equations.

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.

Thank's for your explanation that puts a " light " on your set up that has several " problems ".

If I missed something please let me know.

Regards and enjoy the music,
R.

Dear Lewm: +++++ " It would seem that someone who has actually done this using a quality protractor to evaluate alignment on both tonearms " +++++

IMHO that's is not a " quality protractor " issue but to understand how the whole subject works!!!:

in the link I posted comes everything you have to know about the tonearm/cartridge alignment geometry. Those white papers ( long ones. ) makes a in full explanation in easy words for any one could understand and has all the technical/equations inforamtion too.

The point is that we have to read it carfully, yes it's a long one but if we want to understand about we have to read it.

Through the time I posted that same link because the same subject not less than 10 times and people still don't read it!!!!!

With all respect seems to me that some like you want: " peeled and in the mouth ", this is what we say here in México.

Regards and enjoy the music,
R.

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?