2N301

The 2N301  (P/N 151-0001-00) is a germanium PNP power transistor in a TO-3 package, used in the regulated pre-amp heater power supply of the 502.

RCA announced their first Ge PNP TO-3 types, the 2N301 and 2N301A, in early 1957.

The AD149 is similar.

Some instruments using part 2N301

Instrument	Manufacturer	Class	Model	Description	Introduced
502	Tektronix	Oscilloscope	502	1 MHz dual beam differential scope	1958
502A	Tektronix	Oscilloscope	502A	1 MHz dual beam differential scope	1963

• 502: V647 (sic – still using "V" prefixes for transistors in 1958)
• 502A: Q647 = 2N301 in schematic, parts list says "use 2N2148 (151-0137-00)"

Key Specifications

Collector voltage	max. −40 V
Collector current	max. –3 A
Power dissipation	max. 11 W
Current gain (hFE)	typ. 70 at 1 A collector current

Links

• 2N301 datasheet
• 2N301 @ radiomuseum.org
• RCA 1950s Germanium Power Transistors @ semiconductormuseum.com
• Iz Kalish oral history @ semiconductormuseum.com

Pictures

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