Antique radios, Old Time Radios
721B
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Country:
Worldwide
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| Identical to |
721B
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| Similar
Tubes |
Other characteristic (electr. data):
721A
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| Base |
Top contact with a cap.
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| Was used by |
Radar |
| Filament |
--/-- |
| Description |
Disc-seal TR/ATR tube, with keep-alive electrode connected to a cap. External cavity at 2.7 to 3.3GHz frequency. Long-life version of 721A.
Manufactured by Raytheon, WE and Bomac.
Text in other
languages (may
differ)
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Dimensions (WHD)
incl. pins / tip |
36 x 85 x mm / 1.42 x 3.35 x inch |
| Weight |
30 g / 1.06 oz |
| Information source |
Tube Lore (II) p. 247
- - Manufacturers Literature RFT-Spezialröhren, 1960
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721B: RFT-Spezialröhren 1960
Anonymous 15 Collector
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