TRANSISTOR MUSEUM  

Historic Transistor Photo Gallery   

 

 

Transistor Size (3/16” Diameter X 5/16”)

Date Code 427 (1954 Week 27) on Back

 

Foldover Cardboard Envelope Packaging

 

CBS HYTRON PT-2A

 

TYPE

Germanium Point Contact Transistor

 

USAGE

Amplifier 

 

DATE INTRODUCED

1953

 

CASE STYLES

Silver Metal Cylinder

 

AVAILABILITY

Rare (Limited Production)

 

 

HISTORIC NOTES

CBS-Hytron introduced the PT-2A point contact transistor in 1953, with limited production.  This transistor was designed for amplifier applications, while a similar unit, the PT-2S was designed for switching applications.  Here is some text from the CBS datasheet: “ The PT-2A offers relatively high gain, low input impedance, and high output impedance. Gains of 18db are typical for the PT-2A when used in amplifier circuits of appropriate design.”  The 1955 Lafayette “Money-Saver” catalogue lists the PT-2A as available for $2.90.  This is the last year when point contact transistors were generally available, with junction transistor technology rapidly replacing point contact technology.

 

 

 

Copyright © 2002 by Jack Ward

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