Antique radios, Old Time Radios
NN
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Country:
United States of America (USA)
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| Identical to |
NN
= 221A
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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 5 Volts / If 10 Ampere / Direct |
| Description |
Project coding for 221A.
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| Information source |
Saga of the Vacuum Tube, Tyne page 280
Tube Lore (II) p. 235
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NN: Fin Stewart
Fin Stewart
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Just Qvigstad
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line up.
[rmxtube-en]
| Data Compliance |
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