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.
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