Fidelity Research FR64s Headshell dilemma

Speaking about confusion, The effective length is 246 mm.

And “effective length” is pivot to stylus; 231.5mm or 230mm is pivot to spindle for FR64S. The difference between the two is “overhang”.

@karl_desch  u have hot to the issue. Your answer coicided with a query i made to mintlp - the headshell needs to be longer to do Bearwald or my Clearaudio for that matter. I think i will stick with 230...
btw how are jelco headshells - i bought a magnesium one with azimuth adjustment

Dear @lohanimal  @lewm  @karl_desch  : All of you have a misunderstood of the overall cartridge/tonearm aliggnment  formulas.

Löfgren formulas  use 3 input parameters: tonearm EFFECTIVE LENGTH, most inner groove distance and most outer groove distance. Through the calculations of the alignment we will achieve mainly these output alignment parameters:
overhang, off-set angle, by difference P2S distance and inner and outer null points.

That is the rigth and orthodox way to make the alignment calculations.

Any one can manipulate those parameters, as a fact Stevenson did it when he made to coincide the inner most groove distance with the inner null point, as could be the P2S distance but any kind of parameter input value manipulations will gives us way different output parameters to the orthodox way to make the alignment calculations.

I will repeat here the links I posted along the orthodox way to make " things ".

https://www.vinylengine.com/tonearm_alignment_calculator_pro.php?arm1=Arm+1&l1=ps&a1lv=231.5&a1=la&oh1v=&oa1v=&arm2=Lofgren+A&l2=ps&a2lv=231.5&a2=la&oh2v=&oa2v=&arm3=Lofgren+B&l3=ps&a3lv=231.5&a3=lb&oh3v=&oa3v=&arm4=Stevenson&l4=ps&a4lv=231.5&a4=st&oh4v=&oa4v=&og=iec1&ogv=&ig=iec&igv=&cal=y&submit=calculate

and now P2S 230mm:



https://www.vinylengine.com/tonearm_alignment_calculator_pro.php?arm1=Arm+1&l1=ps&a1lv=230&a1=la&oh1v=&oa1v=&arm2=Lofgren+A&l2=ps&a2lv=230&a2=la&oh2v=&oa2v=&arm3=Lofgren+B&l3=ps&a3lv=230&a3=lb&oh3v=&oa3v=&arm4=Stevenson&l4=ps&a4lv=230&a4=st&oh4v=&oa4v=&og=iec1&ogv=&ig=iec&igv=&cal=y&submit=calculate


@lewm  you can see that the difference between 231.5mm and 230mm P2S is not the overhang: 1.5mm


Now the rigth way to do the alignments calculations taking as one of the input parameters the EFFECTIVE LENGTH:

https://www.vinylengine.com/tonearm_alignment_calculator_pro.php?arm1=Arm+1&l1=el&a1lv=245&a1=la&oh1v=&oa1v=&arm2=Lofgren+A&l2=el&a2lv=245&a2=la&oh2v=&oa2v=&arm3=Lofgren+B&l3=el&a3lv=245&a3=lb&oh3v=&oa3v=&arm4=Stevenson&l4=el&a4lv=245&a4=st&oh4v=&oa4v=&rs=12&rsv=&og=iec1&ogv=&ig=iec&igv=&cal=y&submit=calculate


where the P2S LöfgrenA/Baerwald alignment distance is: 228.14mm

even the gentleman behind MINT LP has a misunderstood too because if he takes this P2S distance we have not any single trouble to mount any cartridge in any headshell in that arm.n  Even we can change the 245mm EL for 250mm and we can set up that arm with any cartridge/headshell if the overall calculations takes that EL with the new P2S distance ! ! 

Till we understand it we will follow posting wrong post on the subject.

We need first to understand the overall Löfgren " idea ".

Regards and enjoy the MUSIC NOT DISTORTIONS,
R. 

Raul, Speaking for myself, I have written nothing at all about the alignment formulae.  I merely was trying to clarify the definition of the terms "effective length" and "overhang", for the benefit of the OP.  In your opinion, did I make an error?  If so, I would be grateful to be corrected.