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Radio Valve Data: 1915-1960Keith R Thrower OBE, The Valve Museum, April, 2022.
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Triode Receiver Valves (pre-1926)* | Type or Trademark | Filament | Anode | Grid | ra | gm | μ | Year | Base | Notes and applications | | | Volts | Amps | Volts | -Volts | kΩ | mA/V | | | | |
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A (multi) | B | 4.0 | 0.45 | 30-100 | | 40.0 | | 7.0 | 1924 | | GP. One filament |
A (multi) | B | 4.0 | 0.90 | 80-150 | | 20.0 | | 7.0 | 1924 | B4/N | O/P. Two filaments |
D.E.2 (multi) | D | 2.0 | 0.35 | 30-80 | | 32.0 | 0.28 | 9.0 | 1925 | B4/N | GP. One filament |
D.E.2 (multi) | D | 2.0 | 0.70 | 30-80 | 0-3 | 16.0 | 0.56 | 9.0 | 1925 | B4/N | O/P. Two filaments |
D.E.3 (multi) | D | 3-4 | 0.10 | 30-120 | | | | | 1925Ω | B4/N | |
D.E.3 (multi) | D | 3-4 | 0.20 | 30-120 | | | | | 1925Ω | B4/N | |
D.E.A (multi) | D | 2.6 | 0.18 | 30-80 | | 40.0 | 0.18 | 7.0 | 1925 | B4/N | GP. One filament |
D.E.A (multi) | D | 2.6 | 0.36 | 80-120 | 3-6 | 20.0 | 0.35 | 7.0 | 1925 | B4/N | GP. Two filaments |
| B | 4-6 | 0.50 | 60-120 | | 80.0 | | 7.0 | 1924 | B4/N | GP. One filament |
Multi | B | 4-6 | 1.0 | | | 40.0 | | 7.0 | 1924 | B4/N | O/P. Two filaments |
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