Transistor Museum Lecture Hall

 “The Early History of Transistors in Germany”

 

Rudi Herzog (Continued)

 

The next big step of development took place at the Industrial Fair in April 1954 again: The “Big Three“ of German electronic industry introduced the first German junction transistors :

 

SIEMENS & HALSKE presented  TF70 and TF71 which were npn-types.

 

TELEFUNKEN showed the OC601 and OC602 , both pnp-types.

 

VALVO came up with the OC70 and OC71 . These two pnp-transistors OC70 and OC71 in Germany became as popular as the CK722 in the US and were used in do-it-yourself applications to the end of the 1970‘s.  

 

All these junction-transistors were available in retail by June 1954.  In October 1954 VALVO presented the first German power-transistor OC15  ( 4 watts). Note that in the same month, the world’s first portable transistor radio TR-1 from Regency came to market in the US.

 

This is a photo of the first commercial junction transistor available from Siemens & Halske.

    

 

Rudi Herzog (Continued) 

 

 

 

 

The two photos above illustrate (1) TELEFUNKEN OC601 pnp junction transistor and (2) VALVO OC70 pnp junction transistor.  Both from 1954. 

 

 

 

Go To Rudi Herzog Page 5

COPYRIGHT © 2001 by Jack Ward.  All Rights Reserved.  http://www.transistormuseum.com/

PAGE 4