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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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| D | 3.0 | 0.06 | | | | | | 1925 | Special | RF amplifier |
Thermionic Relay | D | 4.0 | 0.12 | 30-100 | | | | | 1925 | | General purpose |
Post-1925 amplifying valves, frequency changers and signal diodes | Type | Description | Filament | Anode | Auxillary Grid | Grid | ra | gm/go | RL | Po | Rk | | Year | | | Volts | Amps | Volts | mA | Volts | mA | -V | kΩ | mA/V | kΩ | Watts | Ω | Type | Ref | |
North London Valve Company |
Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless |
HF | Triode | 2.0* | 0.10 | | | - | - | | | | | | | B4 | 1 | |
Leo the Lion | Output triode | 6.0* | 3.90 | 400 | | - | - | | 1.0 | 4.60 | | | | B4 | 1 | 1929 |
Mellodyne | Output triode | 6.0* | 3.90 | 400 | 100.0 | - | - | 90.0 | 800Ω | 4.50 | | | | B4 | 1 | 1929 |
PA60 | Output triode | | | | | - | - | | | | | | | B4 | 1 | 1930 |
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