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
