On 2/4/2009 10:49 AM John Williamson spake thus:

David Nebenzahl wrote:

On 2/4/2009 9:10 AM Brian Gaff spake thus:

The worst I've encountered is the very audible signal from the
adjacent turn so to speak.
I wonder what your sample had been played on though.

What you're describing has nothing to do with vinyl; you're talking
about "print-through", which is an artifact of the tape mastering
machine feeding the cutter, where you can hear signals from adjacent
lengths of tape.

I've heard it a number of times over the years on first play of a vinyl
record, on both 33 and 45 rpm discs, and the pre-echo has always been
*exactly* one revolution ahead of the peak, both on the lead-in and
between tracks or in quiet passages. I'd put it down as an artifact of
either the material of the master deforming slightly while being cut, or
distortion of the plastic while the hot record was cooling after coming
out of the mould. Unless, of course, the feed reel on the tape deck
being used just happened to rotate at the same speed as the turntable.

The latter is much more likely. Can't see how the vinyl could deform
that much and still retain an accurate image from the mold.


--
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"If this stuff worked, you wouldn't need me".

- lifted from sci.electronics.repair