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A SURVEY OF EARLY POWER TRANSISTORS by Joe A. Knight TRANSITRON 1950s/60s GERMANIUMAND SILICON POWER TRANSISTORS |
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ABOVE, L-to-R: Not to be outdone totally in the Germanium transistor field, Transitron was working in parallel on some type of more conventional output device. The first item, the "Z123", is a Germanium prototype similar to the "2N83" prototype, likely from 1955. The next evolution came about with the second item "Z123" in a TO-3 mounting along with it's cut-open version, item number three, likely from 1956. While pretty conventional looking this device did not seem to translates into any viable market product. However, later in 1960, Transitron released a conventional looking Germanium TO-3 type, the last item "2N1421", again not RETMA/JEDEC registered.
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The above portion of an ad, from June of 1958, shows the widening product line of Transitron silicon 'medium power' transistors. Both wide flange and stud mounted versions, rated at 5 watts dissipated power, were now available.
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COPYRIGHT © 2007 by Jack Ward. All Rights Reserved. http://www.transistormuseum.com/ Joe A. Knight Early Power Transistor History – TRANSITRON Page 9 |
