Antique radios, Old Time Radios
1238
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Country:
United States of America (USA)
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| Identical to |
1238
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| Similar
Tubes |
Different maximum ratings:
28D7
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| Base |
Loctal-8, B8G (Sylvania, 1938)
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| Filament |
Vf 28 Volts / If 0.4 Ampere / Indirect |
| Description |
Designed to operate with common, heater and B+, 28V supply. At 0V grid bias, 28V plates and screen grids, delivers 600mW across 1500 ohms plate-to-plate load.
Special version of 28D7 uprated to 3.3W.
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| Information source |
Tube Lore (I)
- - Manufacturers Literature
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1238
Emilio Ciardiello
More ...
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Just Qvigstad
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