Time to choose: Baerwald, Lofgren, Stevenson ?

Something just occurred to me:  Is the offset angle required for Stevenson much more acute than that which is required for Lofgren and Baerwald?  I think it's the opposite, because of the aforementioned need to twist the cartridge inward on a Stevenson tonearm aligned for L or B. This would mean that there is more skating force at the null points with these latter two geometries, compared to Stevenson.  That would be a point in favor of Stevenson.  Just a thought.

Dear @jtimothya : It's not M.Fremer or any other reviewer or tonearm designer whom started to " discuss " about, no.

All kind of alignments ( even personal ones. ) equations calculations ( Löfgen was the first one. )  shows three main set up parameters:

overhang, offset angle and two null points. These is inherent on all kind of alignments.

Why those two null points, other that tell us that there the pivoted tonearm cross tangentialy with "cero " tracking error?
Well, those null points define three LP surface areas where in each one exist ( normally ) diferent distortion levels. Where those null points been calculated define the distortion levels at those 3 LP surface areas : the area before the first null point, the area in between both null points and the area after the second null point. That's it. 

Rgards and enjoy the music,
R.

Something just occurred to me: Is the offset angle required for Stevenson much more acute than that which is required for Lofgren and Baerwald? I think it’s the opposite, because of the aforementioned need to twist the cartridge inward on a Stevenson tonearm aligned for L or B. This would mean that there is more skating force at the null points with these latter two geometries, compared to Stevenson. That would be a point in favor of Stevenson. Just a thought.

I’m not sure, but I believe so (Stevenson = more acute).

Last night, I looked a bit more deeply into the Elison spreadsheet.  The values for cells F3 and G3 are looked up in columns W & X.  I believe you need to generate a set of Stevenson figures for these two columns. 

My Excel chops are a bit rusty, but this much is apparent.  If anyone knows the answer to this, I'd appreciate it.  It might be time to contact John.

Darn you Lew! ... I have so much on my plate and yet this topic is really gnawing at me ;-)

Cheers,
Thom @ Galibier Design

Hi Chakster,

I'm with Raul - that if this concerns you, that you should experiment.  Even Lew stated that he felt uncomfortable about generalizing his resonance experiment across other tonearms.

Cheers,
Thom @ Galibier Design

@thom_mackris

I’ve tried Stevenson for victor ua-7045 on luxman pd444 and it sounds great (no matter LPs or 45s). First cartridge was AT-ML170 OFC mounted at AT technihard shell (at-lh13). The little twist is hardly visible, but i’ve done so to set it up in dead accuracy by Dr.Feickert.

Now i have Victor X1 with Grace HS-6 headshell on the same arm. I use Baerwald, but i sill have to twist the cartridge in headshell even more.

I think Victor UA-7045 was designed with Stevenson alignment in mind, correct me if i’m wrond.

My Reed 3p was designed with Baerwald alignment in mind and this is what i use with Feickert. With Pioneer PC-1000 mk2 the sound is fantastic. I love this cartridge even more now.

Long before i get Dr.Feickert i used protractor from Hi-Fi News Analogue Test LP (they call it Linear Offset technique.) It’s Baerwald and works fine for "12 inch tonearms, there are no errors when i use both now to doubleckeck the accuracy of the old one compared to new.