I just measured the accuracy of the downloadable disc to see how it checked out. I first verified the digital speed read out of this table by using the KAB Electro Acoustics strobe disc. I could leave the table in the preset 33.33 rpm mode and it did not vary from being perfectly strobed and showing the correct speed. As such, the KAB strobe disc and the internal clock of the TT show perfect sync. When i put on the downloaded strobe disc and used the KAB strobe light, i had to vary speed ever so slightly to get it to stand still. When all was said and done, the digital read-out on the TT registered 33.20 rpm.
While this is pretty close ( off by .13 revolutions per minute ), i don't know if it was caused by printer error or is a design error on the disc itself. As we all know, most consumer grade printers are NOT "precision" instruments. While the one that i'm using used to be Hewlett Packard's top of the line model, i've seen it do plenty of strange things. It would be nice if someone else could post their findings and state what they used as points of reference. Sean
PS... In case you're wondering, the table in question is a ReVox B-791.