Gian
Just be aware SAEC has very different alignment and is concerned with inner groove tracking primarily it does not conform to Baerwald, etc
I found these....
..The 308 is a VERY aggressive version of Stevenson. IIRC, it can be 'improved' be lengthening overhang slightly but anything remotely close to what is in the manual will be strange. The other longer tonearms are better but there is in all cases a leaning towards Stevenson-type alignment. The 308 series really almost seems like the geometry is meant for playing old SPs.
For many Japanese after-market arms, it helps to remember that a) the innermost groove according to the Japanese standards (JIS) were a few millimeters closer in (57.6mm) than IEC (60.325mm) standards prevalent at the time (and I think SAEC aimed more at 55-56mm, which would have put it halfway between EP and LP size for JIS at the time), and b) in the 1970s, expensive after-market tonearms were for older people who played vinyl, and that was mostly aimed at people who listened to classical music, which has more potential for significant dynamic changes (raging tympany and cymbals) at the very end of the piece.
The other SAEC arms are basically some kind of modified Stevenson. The 407/23 and the 407TM (which had a slightly different geometry) were 'better' but still not great with SAEC geometry. But they can be 'made to work' reasonably well. The 506/30 can be really great using slightly different parameters (and leaning towards a Stephenson, or a slightly modified Baerwald (because lowest average distortion/TE is great in theory but does not take into account the differences between records, especially those with higher natural dynamic range (i.e naturally higher stylus velocity in the groove) at the end of the side). The 8000ST is perhaps the 'most normal' geometry, but it is stupidly expensive these days.
But in the end, there is no way the 308 geometry can be easily explained as being meant to play LPs...
Personally, I find the most interesting aspect of SAEC tonearms is the way that their resonance can either match or not match a mounting or a material. They are VERY good on tables with metal plinths, or extremely hard-surfaced plinths. They are less good on tables with slightly softer material for a plinth or mounting board.
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