Antique radios, Old Time Radios
S21
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Country:
Great Britain (UK)
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| Identical to |
S21
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| Similar
Tubes |
Other characteristic (electr. data):
S22
Other base:
S21_UX
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| Base |
Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er)
Top contact screw type.
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| Filament |
Vf 2 Volts / If 0.1 Ampere / Direct / Battery = |
| Description |
Lower gain version of the S22 for use in multi-stage receivers
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| Information source |
Experimental Wireless & Wireless Engineer Advert. Aug 1931
Taschenbuch zum Röhren-Codex 1948/49
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Just Qvigstad
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S21: osram wireless guide 1931
Giuseppe Antonio Tusini
More ...
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):12
Collection of
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