Antique radios, Old Time Radios
8D21
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Country:
United States of America (USA)
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| Identical to |
8D21
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| Base |
SPECIAL TUBEBASE in general
2 Top contacts.
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| Filament |
Vf 3.2 Volts / If 125 Ampere / Direct / Specified voltage AC/DC |
| Description |
Dual tetrode developed by RCA for television broadcasting.
Advertised in Electronics, February 1947, page 63.
The metal to glass seal used in this tube was originally invented by William G Housekeeper in 1922. Housekeeper worked at the Western Electric Co in Kearney, New Jersey at the time. His invention was known as the Housekeeper seal and was a key development, used in many later transmitting tubes
Text in other
languages (may
differ)
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| Information source |
-- Original prospect or advert
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8D21: RCA TT
Götz Linss † 27.06.21
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8D21: RCA TT
Götz Linss † 27.06.21
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