UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Vintage Tape (Audio), Cassette, Wire and Magnetic Disc Recorders and Players


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

Thread Tools
Old 27th Jul 2020, 7:59 pm   #21
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......
barrymagrec is offline   Reply With Quote

Thread Tools

All times are GMT +1. The time now is 7:14 am.

All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at
Failure to heed this warning may result in death or serious injury to yourself and/or others.

Powered by vBulletin®
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Copyright ©2002 - 2020, Paul Stenning.