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Old 22nd Dec 2017, 10:40 pm   #19
Ted Kendall
Dekatron
 
Join Date: Jul 2008
Location: Kington, Herefordshire, UK.
Posts: 3,658
Default Re: Revox A77 head mounting

MRL's machinery is based around Studer A80 transports; BASF used Telefunken; the BBC made their tapes for some time on a Telefunken M10A which now sits in my studio.

Proper test tapes are individually made with an operator or control system correcting levels in real time, on selected tape stock, on full track machinery which is calibrated as far as possible from first principles, with the use of flux loops and the like. It is possible to establish absolute perpendicularity of the head gap without the use of a test tape by a rather involved process involving playing the back of the tape.

Given the time and hassle involved in making even a passable secondary test tape, MRL's prices are fully justified, in my view.
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