Fidelity Research FR64s Headshell dilemma
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. |
But not only you have that misunderstood about because even reviewer as M.Fremer or TAS ones have it and several tonearm manufacturers too. Here some examples of that misunderstood: https://www.analogplanet.com/content/uni-din-versus-l%C3%B6fgren-b-just-clarify Years ago and by " accident " I found out that article on the MF site where any of you can read that MF had a total misunderstood about the overall alignment subject. I participated down there and explain him almost the same I did it here. Inside that Analog Planet artricle was an alignment manipulation parameter that’s what the uni-din gentleman did it when he took/fixed a different most inner groove distance than the IEC or DIN standards, he took 54mm that when using IEC standards appears what is in the article chart/diagram. Well even what I posted there months latter in other article about Technics TTs MF again made it same mistakes about. Other example of manipulations was and is what the over 60K SAT tonearm designer did just for marketing and as the uni-din gentleman taking advantage of audiophile and professional reviewers ignorance levels/low knowledge. The SAT designer changed too the most inner groove distance and he surround his tonearm/cartridge alignment set up as something to special that only him or his distributor can make correctly the alignment and no one else. Go figure ! ! ! the SAT tonearm as any other tonearm can be aligned using the normal/orthodox kind of alignments: Löfgren A or B, no problem at all and nothing special on that tonearm set up as the designer wants it the owners must think. No tonearm designer think first than all in the kind of alignment before make his design, only a stupid person could think that SAT, FR, Technics, Ikeda designers made it that way. A tonearm designer is just that: a tonearm designer. The cartridge/tonearm choosed alignment is totally independent of the pivoted tonearm design. What the designer has to choose is his tonearm effective length and when he finish his project then he can choose the alignment that likes him the " more ". It’s our choice to use what the designer says or make a different alignment choice if and only if goes in the orthodox way. Japanese designers choosed ( almost all. ) Stevenson A alignment by their overall misunderstood/ low knowledge level in the subject or total ignorance because is the worst of any alignment you can choose. Stevenso B is his solution similar to Löfgren A/Baerwald. In the past I used Stevenson by my very high levels of ignorance. R. Btw, all tonearms has a limit for the choice of the EL especially the removable headshell designs as the FR. The ones with fixed headshell permits the designer a litle more " play " to choose the effective length. I posted 250mm for the FR but I don't know if it can works because I'm not going to mount and test it in my TT again. |
Alright I must be a total luddite. I tend to use my guage where i place the tip of my stylus in the little circle and put my cartridge body parallel to the lines.Where i put the stylus i was led to believe is the overhang. At present it won't reach that hole. I am familiar with the vinyl engine calculator - it tells what my cartridge is doing @rauliruegas it does not set out where to place my stylus/cartridge within the headshell |
