Antique radios, Old Time Radios
Z21
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Country:
Great Britain (UK)
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| Identical to |
Z21
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| Base |
British-7-Pin, old (M7A) (Codex=Ero)
Top contact with a cap.
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 2 Volts / If 0.1 Ampere / Direct / Battery = |
| Description |
Also available with a 4 pin base. Short grid base pentode. Va<150, Vs<150. Gm=1.7mA/V at the maximum voltages and Ia=1.7mA with -Vg=0.5.
Text in other
languages (may
differ)
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| Information source |
History of the British Radio Valve to 1940 p. 148 & 196
- - Manufacturers Literature
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49
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Z21: Telefunken Werkstattbuch
Wolfgang Bauer
More ...
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Just Qvigstad
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Z21: MARCONI RECEIVING VALVES, LONDON, 1938
Jose Casas-Avalos
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):8
Collection of
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