Transistor Museum Early Germanium Power Transistor History by Joe Knight Transitron Page 10

A SURVEY OF EARLY POWER TRANSISTORS

by Joe A. Knight

TRANSITRON 1950s/60s GERMANIUM AND SILICON

POWER TRANSISTORS

ABOVE, L-to-R: As can be seen from the above developmental Transitron items, the medium power silicon devices utilized silicon's superior heat capacity to great benefit. The first shown item "Z118" is next mounted in a flange mounted enclosure to realize a now 5 watt rated "Z118", shown second. Likewise, the third item "Z122" is next mounted in a flange mounted enclosure for a new 5 watt version "Z122", the fourth item shown. These previous types would correspond to the above ad listed "2N545" and "2N547" types. Finally, the last item "Z124" is just a regular TO-5 silicon transistor inserted in a stud-mounted enclosure for a new 5 watt rating. This would likely correspond to the above ad listed "2N551" type.

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Joe A. Knight Early Power Transistor History – TRANSITRON Page 10