Devised, researched
 and written
  Peter King Smith BSc

                                                         The mid-1960s, German-built multi-track tape recorder with FM/AM/SW radio


A solution to the major recording drawback
Twenty-two minutes minutes is indeed a strange length of time to have picked for the duration of recording off the radio or record player. Although the tape rewind is fast, it is a major disadvantage if you want to record anything longer. Jim Weir wonders whether Standard Elektrik Lorenz had autoreverse in mind when they printed the tape-time indicator in both directions. [ed. 0-22 mins (top to bottom); 22-0 mins (bottom to top)].

46 hours non-stop recording
"On the Schaub-Lorenz 5001/5005, autoreverse recording could, for example, have recorded Track A1, with the red tape-time indicator moving from top to bottom of the vertical dial, with the tape drum running from left to right. After 22 minutes, the tape unit could have automatically - and seamlessly - switched the record/play head to Track A2 (tape-time indicator returning to top of scale, and the tape drum running from right to left)", effectively offering 46 hours of non-stop recording."The same record/play head could have been used, but it would have needed another erase head".

Cassette tape ends further R&D by SEL
"Autoreverse could have got round this, but I suspect that Phillips' new cassette tape (1962, Phillips: Source: put paid to any serious R&D investment by Schaub-Lorenz on this one. As things were, I'd be surprised if they had made much of an overall profit on these things".

1. The 'autoreverse' idea was submitted by Jim Weir in April 2008.
See a reply to this suggestion by one of the inventors in the interview with Siegfried Apitz.