Quote:
Originally Posted by monaro0162
For some reason I assumed that the calibration tape that I have (from an e-bay seller nielsfup2010) was two track because it was made on a B77
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I've seen other people offer these too but essentially they're secondary calibration tapes which have been recorded on (hopefully) a well set up machine. The MRL full track tapes have been recorded on machines which have been modified for the job, are very carefully set up and are constantly checked against a known reference. There's a bit of background at
http://www.mrltapes.com/hodges_mrl.pdf