| Type | Substitutes | Base Diagram |
|---|---|---|
| 1R5 | 1AF5, 1AR5, 1R5SF*, 1AQ5*, 1R5WA |  |
| Notes: | * - Parallel filaments | |
| Web References | 1R5 (Mazda-Belvu) @ Franks Electron Tubes 1R5 (General Electric) @ Franks Electron Tubes 1R5 (Tung-Sol) @ Franks Electron Tubes 1R5 (Brimar) @ Franks Electron Tubes 1R5 @ RadioMuseum.org | |
| Bulb | T-51/2 |
| Outline | 5-2 |
| Base1 | Miniature Button 7-Pin |
| Basing | 7AT |
| Mounting Position | Any |
| Filament Voltage D C | 1.4 | Volts |
| Filament Current | 50 | Ma |
| Filament Voltage D C | (Abs. Max.) | 1.6 |
| Shielded1 | Unshielded | ||
| Mixer Grid to Plate: g3 to p | 0.3 | 0.4 | ��f Max |
| R F Input: g3 to All | 7.0 | 7.0 | ��f |
| Mixer Output: p to All | 12.0 | 7.5 | ��f |
| Oscillator Input: g1 to All | 3.8 | 3.8 | ��f |
| Coupling: g1 to g3 | 0.2 | 0.2 | ��f Max |
| Oscillator Grid to Plate: g1 to p | 0.1 | 0.1 | ��f Max |
| Plate Voltage | 90 | Volts |
| Grid No. 2 and 4 Voltage | 67.5 | Volts |
| Grid No. 2 and 4 Supply Voltage | 90 | Volts |
| Cathode Current | 5.5 | Ma |
| Positive D C Grid No. 3 Voltage | 0 | Volts |
| Plate Voltage | 45 | 67.5 | 90 | Volts |
| Grid No. 2 and 4 Voltage | 45 | 67.5 | 67.5 | Volts |
| Grid No. 3 Voltage | 0 | 0 | 0 | Volts |
| Oscillator Grid (Grid No. 1) Voltage R M S | 15 | 25 | 25 | Volts |
| Oscillator Grid (Grid No. 1) Current | 150 | 250 | 250 | �a |
| Oscillator Grid (Grid No. 1) Resistance | 0.1 | 0.1 | 0.1 | Megohm |
| Plate Resistance (approx.) | 0.5 | 0.4 | 0.4 | Megohm |
| Plate Current | 0.7 | 1.4 | 1.5 | Ma |
| Grid No. 2 and 4 Current | 2.1 | 3.5 | 3.5 | Ma |
| Cathode Current | 3.0 | 5.2 | 5.3 | Ma |
| Conversion Transconductance | 210 | 280 | 280 | �mhos |
| Grid No. 3 Voltage for Gc=10�mhos (approx.) | -7 | -13 | -13 | Volts |
| Grid No. 3 Voltage for Gc=100�Mhos (approx.) | -2.2 | -4.9 | -5.0 | Volts |
| 1 | Shield No. 316 connected to pin 1. |
| 2 | The characteristics shown were obtained with separate excitation. The characteristics under these conditions correspond very closely with those obtained in self-excited oscillatory circuit operating with zero bias. |
