Antique radios, Old Time Radios
3SP1
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Country:
United States of America (USA)
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| Identical to |
3SP1
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| Base |
Duodecal (12-pin), B12A (not glass)
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| Filament |
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| Description |
1.5 x 3" rectangular screen. 2750V accelerating potential; 61V/inch vertical deflection.
Introduced by Waterman in 1955.
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| Information source |
-- Collector info (Sammler)
-- Original prospect or advert
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3SP1: ARRL Handbook 1972
Anonymous 10 Collector
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Just Qvigstad
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