Introduced in 10 January 1933
Characteristics
| Base | UX-Base (4 pins, 2 thick), A4-72 Medium 4-Pin Bayonet Base |
| Type | Triode Power Output |
| Filament | Vf = 2.5 Volts, If = 2.5 Ampere, Direct Specified voltage AC/DC |
| Identical | VT-95, CV1831, KX2A3, NU-2A3 |
| Similar | Different Shape: M45, PM245 Slightly Different: 2A3H, 38213, 845 radio, PX2A3 Different Quality: 2A3-B, 2A3-C Diffrent Max Rating: 2A3-40W Different Heater: 6A3 Different Base and Heater: AD1 Different Various: 1607 RCA, 5930 |
| Predecessor | 45, UX245 |
| Successor | 6A3 |
Maximum Ratings
| Max Anode Voltage (Pin 2) | 300 Volts |
| Max Anode Dissipation | 15 Watts |
Pin Layout
| Pin | Function |
| 1 | Filament |
| 2 | Anode |
| 3 | Grid |
| 4 | Filament |