31A

GOLD TRANSISTOR W/ HEAT SINK - The Western Electric 31A is a vintage milliwatt germanium alloy junction PNP transistor. It was manufactured primarily for specialized telecommunications equipment and circuit development within the Bell System.Key Technical SpecificationsSemiconductor Material: Germanium (Ge)Polarity / Type: PNPStructure: Alloy JunctionPower Class: Milliwatt (Medium/Low Power)Historical Production Era: Mainstream production occurred during the early-to-mid 1960s (with many New Old Stock items bearing 1964 date codes).Historical Significance & CollectibilityBecause Western Electric pioneered the commercial development of the transistor, components like the 31A are highly sought after today by electronics historians, audiophiles, and vintage radio restoration hobbyists.