Antique radios, Old Time Radios
GI-21
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Country:
United States of America (USA)
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| Identical to |
GI-21
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| Similar
Tubes |
Other base:
GI-10
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| Base |
SPECIAL TUBEBASE in general
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| Was used by |
Industrial |
| Filament |
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| Description |
National Union introduced its 'Inditron' line of numeric indicators in 1954, well before the registration of the Nixie tubes by Haydu Brithers.
Each digit from 0 to 9 was connected to one of the 10 base pins. No common electrode, but the digit to light-on had to be driven to ground potential while other digits acted as anode.
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| Information source |
-- Collector info (Sammler)
- - Manufacturers Literature
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Collection of
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