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RE: Pre-echo

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If the echo is exactly 1.8 seconds in front of the real thing (the time for one revolution a 33 1/3 RPM), it is an artifact of mastering the LP. Because laquer is soft, the cutting stylus can very slightly deform the wall of the groove from the previous revolution as it makes each revolution around the master disc. This causes a quiet, ghostly copy to be heard one revolution in advance. I'm sure it varies with groove pitch and the level of signal being cut, but some records don't seem to exhibit it at all while on others it's quite obvious. I've never heard it on a DMM mastered record so it seems to be a side-effect of laquer mastering only.

-Bry

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