Antique radios, Old Time Radios
K1_Thorpe
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Country:
Great Britain (UK)
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| Identical to |
K1_Thorpe
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| First year |
1924
Saga of the Vacuum Tube, Tyne page 388
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| First Source
(s) |
1924 : British Radio Valves - The Vintage Years: 1904-1925 p.41
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914
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| Filament |
Vf 5 Volts / If 0.42 Ampere / Direct / Battery = |
| Description |
Thrower quotes 0.36 amp, while Tyne gives 0.42 amps.
Used a spiral wire wound anode. Probably to circumvent the Marconi patent for cylindrical anode. Thorpe pretended this to be a more efficient "electron trap"...
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Dimensions (WHD)
incl. pins / tip |
48 x 124 x 30 mm / 1.89 x 4.88 x 1.18 inch |
| Weight |
55 g / 1.94 oz |
| Information source |
British Radio Valves - The Vintage Years: 1904-1925
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Just Qvigstad
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K1_Thorpe: own collection
Peter den Boer
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Collection of
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