Antique radios, Old Time Radios
HK255H
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Country:
United States of America (USA)
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| Identical to |
HK255H
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| Predecessor Tubes |
HK255
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| Base |
Other combinations of connections.
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| Was used by |
Transmittertube (Radio) |
| Filament |
Vf 14 Volts / If 40 Ampere / Direct / Specified voltage AC/DC |
| Description |
Pa = 750W 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). Dummy cap on top for stability
Derived from HK255, has only one side cap for plate and one for gammatron plate. Uprated to 750 W. Only pilot production reported by Sibley.
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 |
The AWA Journal volume 10
Tube Lore (II) p. 217
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HK255H: Fin Stewart
Fin Stewart
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