TRANSISTOR MUSEUM

Historic Transistor Photo Gallery

 

 

Transistor Size (5/16L X 3/16W X 5/16H)

Date Code 3-57 (Month 3, 1957)

Packaging - None

 

 

 

 

WESTERN ELECTRIC TYPES 4B and 4C

 

TYPE

Germanium NPN Grown Junction

 

USAGE

Voice and Carrier Frequency

Telephone Equipment

 

DATE INTRODUCED

1957

 

CASE STYLES

Grey Painted Metal

 

AVAILABILITY

Rare (Limited Production)

 

HISTORIC NOTES

Because transistors offered potential advantages over vacuum tubes in higher reliability, lower power requirements and smaller size, Western Electric was eager to utilize this new technology in the 1950s. An obvious choice was in the voice and carrier telephone systems manufactured and employed in large quantities by Western Electric to accommodate the rapidly growing number of phone calls in the U.S. The types 4B and 4C devices were production quality transistors developed and manufactured by Western Electric in Allentown, Pa. in the mid 1950s. These transistors had been developed from earlier prototypes, including type 1858 developmental transistor. By 1957, the types 4B (for voice systems) and 4C (for carrier systems) performed well enough to be used in production for the telephone systems equipment. These transistors were of the grown junction type, which was the first junction transistor technology, developed at Bell Labs in the early 1950s. Grown junction technology was largely obsolete by the early 1960s.

 

 

 

Copyright 2004 by Jack Ward

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