TRANSISTOR MUSEUM™  

Historic Transistor Photo Gallery   

 

Transistor Size (1/4” Diameter X 1/2”)

Date Code 3-54 (1954 Week 3) on Back

 

3 1/2” X 2 1/2” Cardboard Package

(Includes unmarked internal “tin” envelope and unmarked white cardboard matchbook holder)

 

WESTERN ELECTRIC

2N22

 

TYPE

Germanium Cartridge Type

Point Contact Transistor

 

USAGE

Low Speed (1Mc) Switching Applications

 

DATE INTRODUCED

1952

 

CASE STYLES

Metal Cartridge

 

AVAILABILITY

Very Rare (Limited Production)

HISTORIC NOTES

The original point contact transistor types developed by Bell Labs/Western Electric in the early 1950s included several different case styles, which were used primarily to further understand the manufacturing and performance limitations of the first transistor technology.  The metal cartridge case style, (see Transistor Museum™ Type A) was the first “mechanically-rugged” point contact transistor.  Developmental model numbers of this type included (among others) the 1698, 1768, and 1729.  Western Electric was interested in standardizing the nomenclature and identification of these early transistors, and used the RTMA industry organization to apply standard “2N” numbers to the proprietary types.  By mid 1952, the 1698 cartridge style point contact transistor was confirmed as the 2N22.  The 2N22 was not produced in large numbers, and there are few remaining units.  The metal cartridge case style was not selected for further development, and by 1956 all WECO transistors of this style were obsolete.  The 2N22 was most likely used primarily for experimental circuit development and manufacturing process characterization at Bell Labs/Western Electric.  

 

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