Antique radios, Old Time Radios
3B21
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Country:
United States of America (USA)
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| Identical to |
3B21
= 38401
= CV2959
= EL302.5
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| Similar
Tubes |
Different maximum ratings:
3B22
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| First Source
(s) |
28.Oct.1942 : Electron Tube Registration List rec. 308
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