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Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players Open-reel tape recorders, cassette recorders, 8-track players etc.

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Old 27th Jul 2020, 7:59 pm   #21
barrymagrec
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Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 797
Default Re: Circa 1970 tape machines: low-speed modes

The DC biased Magnetophon ran at 1m/s. When AC bias was introduced, the speed could be reduced to 77cm/s as the bandwidth, s/n ratio and distortion were all substantially improved. It also meant that a 1km length of tape would give twenty minutes' continuous recording. Before AC bias, experiments were in hand to record two simultaneous tracks at differing levels with level-dependent switching on playback to improve the s/n ratio. The redundant head from this development enabled the consruction of the first stereo tape machines by RRG.[/QUOTE]

Yes indeed, but why 77cm/s, why not 75 or 80 or even 78cm/s, in line with records......
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