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 1^st/2^nd 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.
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