Antique radios, Old Time Radios
HK255
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Country:
United States of America (USA)
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| Identical to |
HK255
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Successor Tubes
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HK255H
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| Was used by |
Transmittertube (Radio) |
| Filament |
Vf 14 Volts / If 30 Ampere / Direct / Specified voltage AC/DC |
| Description |
Pa = 500W
This gridless GAMMATRON was developed so as not to infringe with the Lee de Forest patent (owner RCA) on the control grid. Instead, the plate close to the filament has influence on the electron flow towards the other plate (anode).
Hard-glass bulb, two anode caps from one side, two gamma plate caps from the opposite side and a dummy top cap for stability.
The only Gammatron made in quantity.
Text in other
languages (may
differ)
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Dimensions (WHD)
incl. pins / tip |
x 462 x mm / x 18.19 x inch |
| Information source |
Tube Lore (II) p. 217
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HK255: F.C. Jones
Wolfgang Holtmann
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