Antique radios, Old Time Radios
7D21
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| Tube type: |
Transmitting Tetrode, air cooled Power/Output |
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| Identical to |
7D21
= 4F1-TR
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| Base |
COAXIAL in general (X..)
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| Filament |
Vf 6.3 Volts / If 30 Ampere / Direct |
| Description |
Forced air cooled transmitting tetrode, capable of 1200W anode dissipation. Thoriated tungsten cathode. Can be used full ratings up to 110MHz.
General Electric and Fivre (Italy) known manufacturers.
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| Weight |
1700 g / 59.97 oz |
| Information source |
- - Manufacturers Literature
Tube Lore (I)
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7D21: Manufacturer's Literature
Emilio Ciardiello
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