Antique radios, Old Time Radios
CF187
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Country:
United States of America (USA)
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| Identical to |
CF187
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| Base |
Edison (candelabra) 12 mm
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| Was used by |
Military and/or Government |
| Filament |
Direct / Battery = |
| Description |
This tube was one of the last of the original design de Forest Audion E12 based tubes to be made - around 1918. It useed "dumet" wire in the press, rather than the usual platinum. (Dumet wire is a nickel iron core with a copper sheath and was invented by Colin G Fink of the G E Co Research Laboratories in 1913). Because the tubes were designed for the Navy, de Forest was allowed to use the new lead-in wire. These tubes were used by the U S Navy as replacements for a very short time in older Navy radio eqiuipment.
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| Information source |
-- Collector info (Sammler)
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