TRANSISTOR MUSEUM  

Historic Transistor Photo Gallery   

 

 

 

Transistor Size (1/2”L X 3/8”W X 1/2”H)

Date Code 704 (1957 Week 4) on Back

 

Packaging- None

 

 

 

GE 2N135 2N136 2N137

 

TYPE

Germanium PNP Alloy Junction

Radio Receiver RF and IF

 

USAGE

Commercial Radios  

 

DATE INTRODUCED

1955

 

CASE STYLES

Black Metal Pinched Top (Early)

 

AVAILABILITY

Rare to Common

 (Use Limited to Radio Sets)

 

HISTORIC NOTES

The 2N135, 2N136 and 2N137 series of alloy junction germanium transistors was introduced by General Electric in 1955 and was intended for RF (2N136/37) and IF (2N135) service in broadcast receivers.  GE’s first commercial transistor radios, the 675 series, used these transistors in the converter and 1st/2nd IF circuits.   Rapid improvements in transistor technology rendered this series of devices obsolete by 1957, although GE continued to sell the series for several years for repair purposes. For example, the 1958 Newark Electronics catalogue listed these as “Entertainment Group” devices and sold them for $2.10 (2N135), $2.51 (2N136) and $6.07 (2N137).   The first edition of the GE Transistor Manual (1955) provides a list of commercial transistor radios which either used this series of transistors as original parts, or could be repaired with this series – a partial list of the radios includes: Bulova 270, CBS TR250, Dewald 701/702, and Raytheon T-100.  

 

 

 

 

Copyright © 2004 by Jack Ward

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