Type | Substitutes | Base Diagram |
---|---|---|
12B4A | 12B4*† | |
Notes: | * - Parallel filaments † - Series circuit no controlled warm-up | |
Web References | 12B4A (RCA (HB3)) @ Franks Electron Tubes 12B4A (Tung-Sol) @ Franks Electron Tubes 12B4A (RCA (RC30)) @ Franks Electron Tubes 12B4A @ RadioMuseum.org |
Basing | 9AG |
Heater Voltage | 12.6/6.3 | Volts |
Heater Current | 0.3/0.6 | A |