A SURVEY OF EARLY POWER TRANSISTORS

by Joe A. Knight

IBM 1950s GERMANIUM

POWER TRANSISTORS

 

An early experimental IBM Model 604 'transistorized' (instead of tubes) computer was first shown in October of 1954, using circuit boards stuffed with transistors bought from outside sources. However, one experimental semiconductor device was made by IBM and this was called the "X-4". This was a 'thyratron type' transistor developed to control large currents as a relay driver. This device was invented by Richard F. Rutz while working at IBM and first mentioned in an AIEE-IRE Conference paper in June, 1955.

 

 

ABOVE: The left hand column is from an IBM ad from the 'Proceedings of the IRE', June, 1956. It describes and shows the physical construction of the IBM X-4 Transistor. The right hand column is from "Transistors in Radio and Television" by Milton Kiver, 1956, showing the actual insides of the X-4 Transistor, matching that shown in the photos on the next page.

Go To IBM Early Power Transistors, Page 3

 

COPYRIGHT 2007 by Jack Ward. All Rights Reserved. http://www.transistormuseum.com/

Joe A. Knight Early Power Transistor History IBM Page 2