Antique radios, Old Time Radios
331A
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Country:
United States of America (USA)
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| Identical to |
331A
= 805
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| Similar
Tubes |
Normally replaceable-slightly different:
RK57
; VT143
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| Base |
Jumbo 4-pin bayonet (1918)
Top contact with a cap.
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| Was used by |
Transmittertube (Radio) |
| Filament |
Vf 10 Volts / If 3.2 Ampere / Direct / Specified voltage AC/DC |
| Description |
High-mu transmitting triode, graphite anode. 125W, 30MHz, typical mu=40; also used as class B modulator. 4-pin jumbo base.
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Dimensions (WHD)
incl. pins / tip |
x 221 x 64 mm / x 8.70 x 2.52 inch |
| Information source |
Tube Lore (I)
Babani, International Radio Tube Encyclopaedia p. 181 & 182
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Tube Lore (II)
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331A: ARRL Handbook 1972
Anonymous 10 Collector
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Just Qvigstad
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