Dear friends: I know for sure that many of us does not understand in deep the geometry cartridge/tonearm set up with both Löfgren solutions/equations and this fact is normal even some tonearm designers did not either, I know this because I asked with no certain responses.
The Löfgren equations, as I posted , are the only ones that exist that as a main targets are to calculate overhang and offset angle due to three input numbers ( tonearm effective length, most inner and outer groove distance. ), the calculation needs no other single input number and this fact is similar for the other clones/Copy solutions ( Baerwald, Stevenson, etc, etc. ).
We don't need any other geometry parameter to make a tonearm/cartridge set up: effective length, overhang and offset angle are all we need. Even we don't have to care on the null points.
The null points are calculated and used for other things than stylus-cantilever/tonearm geometry set up.
The Stevenson A cloned/solution ( adopted by several Japanese tonearm manufacturers. IMHO with out in deep analysis. ) is not something with " new " equations, Stevenson only wanted that at the inner groove the tracking error be cero so he taked one of the three input numbers ( in the Löfgren formulas. ): most inner grove distance as one null point and that's all.
This " solution " gives you almost cero tracking error/distortion in the last 30 seconds of a LP with a higher distortions on all the remaining LP surface than in any other " solution ".
Any one of us can change ( in the Löfgren equations. ) this same input number and Voilá! we have a " new " Perry/Jones/Lopez/etc solution!!!.
Till today, IMHO, no geometry set up solution beats the Löfgren ones.
The Löfgren solution passed ( and is. ) trhough a Optimization process ( minimax principle. ) to achieve the criterions that I posted in my Thuchan answer.
Today there is no known equations or process that outperform the Löfgren optimization formulas to calculate: overhang and offset angle in a pivoted tonearm in static playback conditions.
Regards and enjoy the music,
Raul.
The Löfgren equations, as I posted , are the only ones that exist that as a main targets are to calculate overhang and offset angle due to three input numbers ( tonearm effective length, most inner and outer groove distance. ), the calculation needs no other single input number and this fact is similar for the other clones/Copy solutions ( Baerwald, Stevenson, etc, etc. ).
We don't need any other geometry parameter to make a tonearm/cartridge set up: effective length, overhang and offset angle are all we need. Even we don't have to care on the null points.
The null points are calculated and used for other things than stylus-cantilever/tonearm geometry set up.
The Stevenson A cloned/solution ( adopted by several Japanese tonearm manufacturers. IMHO with out in deep analysis. ) is not something with " new " equations, Stevenson only wanted that at the inner groove the tracking error be cero so he taked one of the three input numbers ( in the Löfgren formulas. ): most inner grove distance as one null point and that's all.
This " solution " gives you almost cero tracking error/distortion in the last 30 seconds of a LP with a higher distortions on all the remaining LP surface than in any other " solution ".
Any one of us can change ( in the Löfgren equations. ) this same input number and Voilá! we have a " new " Perry/Jones/Lopez/etc solution!!!.
Till today, IMHO, no geometry set up solution beats the Löfgren ones.
The Löfgren solution passed ( and is. ) trhough a Optimization process ( minimax principle. ) to achieve the criterions that I posted in my Thuchan answer.
Today there is no known equations or process that outperform the Löfgren optimization formulas to calculate: overhang and offset angle in a pivoted tonearm in static playback conditions.
Regards and enjoy the music,
Raul.