Antique radios, Old Time Radios
4D21
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Country:
United States of America (USA)
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Brand:
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| Tube type: |
Transmitting Tetrode, air cooled Power/Output |
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| Identical to |
4D21
= CV2963
= PL-4D21
= E125A
= 4-125A
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| Similar
Tubes |
Normally replaceable-slightly different:
6155
Different maximum ratings:
4D21A
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| Base |
Giant 5 pin medium shell B5D
Top contact with a cap.
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| Was used by |
Transmittertube (Radio) |
| Filament |
Vf 5 Volts / If 6.5 Ampere / Direct / Specified voltage AC/DC |
| Description |
5-pin jumbo base B5D. 125w output
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Dimensions (WHD)
incl. pins / tip |
x 124 x 62 mm / x 4.88 x 2.44 inch |
| Tube prices |
1 Tube prices (visible for members
only)
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| Information source |
Tube Lore (II) p. 87
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49
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4D21: ARRL Handbook 1972
Anonymous 10 Collector
More ...
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Just Qvigstad
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4D21: RCA Transm. Tubes 1956
Otto Frosinn
More ...
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Collection of
Collection of a member from FIN |
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