Antique radios, Old Time Radios
DE7
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Country:
Great Britain (UK)
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Brand:
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| Tube type: |
Space Charge Tetrode Text |
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| Identical to |
DE7
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| Similar
Tubes |
Heater different:
FE3_MO
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| First Source
(s) |
1924 : British Radio Valves - The Vintage Years: 1904-1925 p.65
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| Predecessor Tubes |
FE3_MO
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=So)
Sidecontact.
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| Filament |
Vf 1.8 Volts / If 0.4 Ampere / Direct / Battery = |
| Description |
Va 6-20 V. Inner grid 6-15 V. For H.T.less circuits, e.g.in Unidyne receivers. In the commercial life of this tube, four variations were made.
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| Information source |
Taschenbuch zum Röhren-Codex 1948/49 1925 Brown Brothers Catalog 217
Saga of the Vacuum Tube, Tyne Pages 382 & 383
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DE7: Fin Stewart
Fin Stewart
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Just Qvigstad
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DE7: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector
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Collection of
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