Antique radios, Old Time Radios
Moorhead_Ext_Grid
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Country:
United States of America (USA)
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| Identical to |
Moorhead_Ext_Grid
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| First year |
Sep.1916
Saga of the Vacuum Tube, Tyne page 168 and 169.
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| Predecessor Tubes |
ER_Moorhead
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| Base |
Wires
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 4 Volts / If 1.5 Ampere / Direct / Battery = |
| Description |
The External Grid Moorhead was an attempt to circumvent the DeForest Triode patent. It was first advertised in the Electrical Experimenter, September 1916. Performance of this type was inferior to the standard design. This was the first Moorhead tube to be marked. There are two versions: The External Grid (made of strong stamped brass gauze) tube normally has a thick plate with Moorhead markings, but some have been seen with a thin unmarked plate.
The tube is double ended. and has a single filament.
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| Information source |
Saga of the Vacuum Tube, Tyne Page 168
-- Collector info (Sammler)
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Collection of
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You reach this tube or valve page from a search
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