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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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| B | 5.0 | 0.40 | 40-80 | | 20.0 | 0.27 | 5.4 | 1924 | | Det./AF amplifier |
F.2 (blue) | B | 5.0 | 0.40 | 40-80 | | 74.0 | 0.20 | 15.0 | 1924 | B4 | RF amplifier |
| D | 4.0 | 0.10 | 40-100 | 4.5 | 13.0 | 0.46 | 6.0 | 1925 | B4 | Det./AF amplifier |
F.E.R.1 (6V) | D | 6.0 | 0.10 | 40-100 | 4.5 | 12.5 | 0.48 | 6.0 | 1925 | B4 | Det./AF amplifier |
| D | 4.0 | 0.10 | 40-100 | 1.5 | 24.0 | 0.50 | 12.0 | 1925 | B4 | RF amplifier |
F.E.R.2 (6V) | D | 6.0 | 0.10 | 40-100 | 1.5 | 23.0 | 0.52 | 12.0 | 1925 | B4 | RF amplifier |
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 | |
Louden |
Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless |
| AF triode | 4.0* | 0.10 | 40-100 | 4.5 | - | - | 1.5-7.5 | 12.5 | 0.48 | | | | B4 | 1 | 1925 |
F.E.R.1 (6V) | AF triode | 6.0* | 0.10 | 40-100 | 4.5 | - | - | | 12.5 | 0.48 | | | | B4 | 1 | 1925 |
F.E.R.2 (4V) | RF triode | 4.0* | 0.10 | 40-100 | 1.5 | - | - | 0-3 | 24.0 | 0.50 | | | | B4 | 1 | 1925 |
| RF triode | 6.0* | 0.10 | 40-100 | 1.5 | - | - | | 23.0 | 0.52 | | | | B4 | 1 | 1925 |
F.E.R.3 (4V) | Detector triode | 4.0* | 0.10 | 20-80 | | - | - | | 17.0 | 0.47 | | | | B4 | 1 | 1927 |
F.E.R.3 (6V) | Detector triode | 6.0* | 0.10 | 20-80 | | - | - | | | | | | | B4 | 1 | 1927 |
L.E.R.1 | AF triode | 2.0* | 0.20 | 40-100 | | - | - | 1.5-4.5 | 20.0 | 0.25 | | | | B4 | 1 | 1926 |
L.E.R.2 | RF triode | 2.0* | 0.20 | 40-100 | | - | - | 0-3 | 40.0 | 0.30 | | | | B4 | 1 | 1926 |
L.E.R.3 | Detector triode | 2.0* | 0.20 | 20-80 | | - | - | | 33.0 | 0.24 | | | | B4 | 1 | 1926 |
| Output triode | 4.0* | 0.20 | 60-200 | | - | - | 3-15 | 8.0 | 0.90 | | | | B4 | 1 | 1926 |
P.E.R.1 (6V) | Output triode | 6.0* | 0.20 | 60-200 | | - | - | 3-15 | 8.0 | 0.90 | | | | B4 | 1 | 1926 |
P.E.R.2 (4V) | Output triode | 4.0* | 0.20 | 60-200 | | - | - | 0-4.5 | 20.0 | 0.90 | | | | B4 | 1 | 1926 |
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P.E.R.2 (6V) | Output triode | 6.0* | 0.20 | 60-200 | | - | - | 0-4.5 | 20.0 | 0.90 | | | | B4 | 1 | 1926 |
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