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Radio Valve Data: 1915-1960Keith R Thrower OBE, The Valve Museum, April, 2022.
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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 | |
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Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless |
G125 | General purpose triode | 1.0* | 0.25 | 30-60 | | - | - | | 25.0 | 0.22 | | | | B4 | 1 | 1926 |
| General purpose triode | 1.0* | 0.25 | 30-60 | | - | - | | 25.0 | 0.22 | | | | UV | 1 | 1926 |
| General purpose triode | 2.0* | 0.28 | 60-120 | | - | - | | 17.0 | 0.50 | | | | B4 | 1 | 1926 |
| RF or detector triode | 1.0* | 0.25 | 60-90 | | - | - | | 45.0 | 0.26 | | | | B4 | 1 | 1926 |
H125A | RF or detector triode | 1.0* | 0.25 | | | - | - | | 45.0 | 0.26 | | | | UV | 1 | 1926 |
P125 | Output triode | 1.0* | 0.25 | | | - | - | | | | | | | B4 | 1 | 1926 |
P125A | Output triode | 1.0* | 0.26 | | | - | - | | | | | | | B4 | 1 | 1926 |
| Output triode | 4.0* | 0.28 | 130 | | - | - | 2-8 | | 1.10 | | | | B4 | 1 | 1926 |
P425A | Output triode | 4.0* | 0.29 | 130 | | - | - | 2-8 | | 1.10 | | | | B4 | 1 | 1926 |
P485 | Output triode | 4.0* | 0.90 | 130 | | - | - | 3-12 | | 1.00 | | | | B4 | 1 | 1926 |
P612 | Output triode | 6.0* | 0.12 | 130 | | - | - | 2-8 | | 1.00 | | | | B4 | 1 | 1926 |
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 | |
BSA Standard |
Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless |
G.125 | General-purpose triode | 1.0 | 0.25 | 60 | | - | - | | 25.0 | 0.24 | | | | B4 | 1 | 1925 |
G.125A | General-purpose triode | 1.0 | 0.25 | 50 | | - | - | | 25.0 | 0.24 | | | | UV | 1 | 1925 |
H.125 | RF or detector triode | 1.0 | 0.25 | 60-90 | | - | - | | 45.0 | 0.24 | | | | B4 | 1 | 1925 |
H.125A | RF or detector triode | 1.0 | 0.25 | 60-90 | | - | - | | 45.0 | 0.24 | | | | UV | 1 | 1925 |
P.425 | Output triode | 4.0 | 0.90 | 120-160 | | - | - | 2-8 | 5.5 | 1.00 | | | | B4 | 1 | 1925 |
P.425A | Output triode | 4.0 | 0.25 | 120-160 | | - | - | 2-8 | 6.0 | 1.00 | | | | UV | 1 | 1925 |
P.A.4 | Output triode | 4.0 | 0.25 | 100-160 | | - | - | 5-15 | 6.0 | 1.00 | | | | B4 | 1 | 1925 |
P.B.1 | Triode (no data) | | | | | - | - | | | | | | | - | - | |
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