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Re: Perhaps you should either measure or calculate the error before going to all that trouble...

Hi John,

The degree of error of the innermost grooves depends on how closely the groves go to the record label. I have a few rock records which go almost all the way inwards to the label, with very little lead-out groove or area. When I calculated their error, it was well over 0.8 degrees.

The audibility of the error of the innermost grooves is the highest because their wavelength of recorded sound in the record is the shortest. Records are cut at constant angular velocity, not constant linear velocity.

I for years tried many different high-end cartridges and pivoted tonearms (Alphason, Graham, Rega, SME), all with the desire and intent to accurately replay my rock records with no audible distortion. Unfortunately all had a grain and impurity to vocals, cymbals, and strings on the last cut or two of records. Vocals were never locked dead center. I could never make these annoying problems go away. It wasn't until I went to a linear tracking tonearm that they were eliminated.

I suspect the degree of audibility of geometric error depends on the record, music style and content, one's hearing acuity, and high frequency characteristics and capabilities of one's speakers. Add to this the cost and complexity to design and produce a proper linear-tracking tonearm and you can see why they had limited market penetration. Imagine if SME made a servo-controlled linear tracking verstion of their V tonearm. It would most likely be awesome but also probably 2x or 3x the price of the V!

As for me, I'm keeping my Goldmund Studio with T-3F arm!

Donald North


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  • Re: Perhaps you should either measure or calculate the error before going to all that trouble... - Donald North 14:06:47 04/06/07 (0)


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