Antique radios, Old Time Radios
5D21
| Base |
Medium 4-pin, ceramic disc
Top contact with a cap.
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| Was used by |
Radar |
| Filament |
Vf 26 Volts / If 2.1 Ampere / Half indirect |
| Description |
Pulse power tetrode intended for radar modulators. Uprated 715B with corona guarding ring on plate cap. Grid top cooling fins removed and cooling provided by copper connections to the base pins. 20 kV, 15 A peak, 60 W average pulse handling capability. Heaters designed to operate directly from the aircraft storage battery, between 22 and 28.5 V.
Could be replaced by 715C.
Also made by Raytheon, RCA, STC.
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Dimensions (WHD)
incl. pins / tip |
65 x 149 x mm / 2.56 x 5.87 x inch |
| Information source |
Tube Lore (I)
-- Original-techn. papers. BSTJ
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5D21: Manuale delle valvole
Giuseppe Antonio Tusini
More ...
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Just Qvigstad
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5D21: Manuale delle valvole
Giuseppe Antonio Tusini
More ...
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Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):1
Collection of
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