In , on 01/06/04
at 10:03 PM, ow (Goofball_star_dot_etal) said:

Here are some plots:
http://www.wareing77.plus.com/Valle-TT-Polar.jpg
http://www.wareing77.plus.com/Linn-1k-1-Polar.jpg
The .wav files from which these are obtained are those used by
Stereophile, kindly supplied by JA .The data are shown with JA's and
Carl Valle's approval.
The scales are different for the two with a frequency span of 0.5% for
the Linn and 1.5% for Valle. This is because Carl's LP was not so well
centred and this accounts for much of the increased width of the
published spectrum. The average frequency is much closer to the ideal
1kHz for "Valle" (direct drive) than "Linn". More types of plots are
available, if anyone is interested.

Are the Valle traces made without lifting the arm? It seems like
successive revolutions are not as well registered as with the Linn.

Did you use a high pass filter?

Have you done any spectral analysis? It seems almost like there are
side tones. Is the arm being excited?

The peak to peak variation seems lower on the Linn. Would you attribute
this to less bearing problems or a flatter record?

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