Antique radios, Old Time Radios
3A
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Country:
United States of America (USA)
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| Identical to |
3A
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| Predecessor Tubes |
1A
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| Base |
Wires
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| Was used by |
Technology / Measurement |
| Filament |
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| Description |
Sensivity: 100 µA/lm
First made in 1926, this tube replaced the 1A. It was caesium dioxide as a photosensitive surface.
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| Information source |
-- Collector info (Sammler)
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Collection of
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