Antique radios, Old Time Radios
831A
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Country:
United States of America (USA)
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| Identical to |
831A
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| Base |
Pin-and-blade jumbo (3 contacts)
Top contact with a cap.
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Direct |
| Description |
This tube is a specially designed version of the 831. It has has a "floating" graphite anode suspended on "lava" collars ti eliminate the "corona effect".
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| Information source |
Tube Lore (II) p. 77
Babani, International Radio Tube Encyclopaedia p. 182 & 183
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Just Qvigstad
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