TRANSISTOR MUSEUM  

Historic Transistor Photo Gallery   

 

 

Transistor Size (1 1/2” L X 1” W X 1/4”H)

Date Code 1957 Week 16 (716 on Top)

 

Cardboard Vacuum Tube Style Packaging

 

 

SYLVANIA 2N307

 

TYPE

Germanium PNP Alloy Junction

Power Audio Amplifier

 

USAGE

Hobbyist/Experimenter 

 

DATE INTRODUCED

Mid 1950s

 

CASE STYLES

Black Metal (Early)

Silver Metal (Later)

 

AVAILABILITY

Common (High Volume Production)

 

HISTORIC NOTES

Sylvania was an early manufacturer of germanium power transistors, including the 2N307 transistor – other companies also involved in early power transistors include RCA, Motorola, Bendix and Honeywell.  Both Sylvania and RCA were volume manufacturers of the 2N307, and, in addition, RCA produced a booklet “Practical Transistor Circuits Utilizing the 2N307” to popularize this transistor for audio and other low frequency power applications. The 2N307 is capable of delivering 10 watts output (1 Amp maximum current).  It was ideally suited for early solid state audio power amps. The 1960 Lafayette Semi-conductor Directory lists the RCA 2N307 as available for $1.50 and the Sylvania version of the 2N307 for $1.35.   The diamond-shaped case style of the 2N307 is very distinctive and is associated with power transistor development done at Motorola in the mid 1950s. This case style was designated as TO-3 and was first used in large scale production for the output transistors in AM car radios of that time.   

 

 

 

 

Copyright © 2002 by Jack Ward

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