Dear Henry,

I won't comment on the effective length in conjunction with manufacturer specified mounting distance, as this will no doubt (since it had done so in the not so far away past....) bring up all the tonearm geometry experts who do claim the opposite.

On to your question:

you can align ANY given pivot tonearm so some kind of geometrical "correct" geometry, even if his specified mounting distance is "off" by some millimeters.

However - it will ALWAYS alter the geometry - in other words: - you will NOT obtain the geometry the designer specified and optimized the tonearm for.

The location of the 2 zeros and the maximum errors of the tangential curve will be different and most likely not ideal.

Since opinion about where to specify the location of the 2 zeros do indeed differ and depends on the majority of records played with the tonearm in question this point is regarded by many audiophiles as being less important.

I however would always recommend holding exactly to the manufacturers specification (unless you are able to re-calculate a toenarm geometry yourself) and to align to a tangential curve with teh 2 zeros spread fairly wide and the 2nd close to the run-out grooves.

This will most likely give you the most stable soundstage AND the least inner groove distortion.

Cheers,

D.

I won't comment on the effective length in conjunction with manufacturer specified mounting distance, as this will no doubt (since it had done so in the not so far away past....) bring up all the tonearm geometry experts who do claim the opposite.

On to your question:

you can align ANY given pivot tonearm so some kind of geometrical "correct" geometry, even if his specified mounting distance is "off" by some millimeters.

However - it will ALWAYS alter the geometry - in other words: - you will NOT obtain the geometry the designer specified and optimized the tonearm for.

The location of the 2 zeros and the maximum errors of the tangential curve will be different and most likely not ideal.

Since opinion about where to specify the location of the 2 zeros do indeed differ and depends on the majority of records played with the tonearm in question this point is regarded by many audiophiles as being less important.

I however would always recommend holding exactly to the manufacturers specification (unless you are able to re-calculate a toenarm geometry yourself) and to align to a tangential curve with teh 2 zeros spread fairly wide and the 2nd close to the run-out grooves.

This will most likely give you the most stable soundstage AND the least inner groove distortion.

Cheers,

D.