TRANSISTOR MUSEUM

Historic Transistor Photo Gallery

 

 

 

Transistor Size (3/4 Diameter Dome X 1/2 H)

Date Code 643 (1956 Week 43)

 

Packaging- Cardboard Box

 

CBS HYTRON 2N155

 

TYPE

Germanium PNP Power Alloy Junction

 

USAGE

Audio/Hobbyist

 

DATE INTRODUCED

1956

 

CASE STYLES

Black Metal (Early)

Silver Metal (Later)

 

AVAILABILITY

Common (High Volume Production)

 

 

 

HISTORIC NOTES

CBS Hytron was never a major producer of semiconductors, but did have an early success with germanium power transistors. The 2N155, shown in the photo, was one of first power transistors available to the general public, and was used in a variety of applications which required more power handling capability than the smaller types common at the time. Examples of applications of these early power transistors included audio output for hybrid car radios, power supply switching circuits and general hobbyist/experimenter usage (small audio amps, megaphones, etc). The 2N155 could be substituted for a number of other germanium power transistors, including the 2N176 and 2N301. CBS Hytron was bought out by Raytheon in the late 1950s, but transistors were still produced using the CBS name until the mid 1960s. The Raytheon labeled version of the 2N155 sold for $3.75 in the 1958 Burnstein Applebee Radio Electronics catalogue, and the CBS labeled version sold for $2.78 in the 1962 Lafayette Radio catalogue.

 

 

 

Copyright 2004 by Jack Ward

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