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ID = 16982
United States of America (USA)
Brand: Heintz & Kaufman Ltd. (Gammatron); San Francisco, CA
Developer: Heintz & Kaufman Ltd. (Gammatron); San Francisco, CA 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to 254 = 254W

Base Jumbo 4-pin bayonet (1918) (Codex=Bz) Sidecontact and top contact.
Was used by Radio/TV-reception etc.
Filament Vf 5 Volts / If 7.5 Ampere / Direct / Specified voltage AND current AC/DC

The HK-254 is a 100 watt dissipation triode originally made by Heintz and Kaufman (Gammatron series) with a mu of 25 and a maximum frequency of 175 MHz for full ratings. Early versions had an open anode and no shield around the press. Tantalum plate and hard-glass, nonex envelope. 4-pin jumbo base.

Similar tubes were later made by:

Lewis and Kaufman (LK-254)

Eimac (254W)

Penta Labs (PL-254W)

Vacuum Tube Prod. Co. (254W)

Dimensions (WHD)
incl. pins / tip
x 184 x 62 mm / x 7.24 x 2.44 inch
Weight 190 g / 6.70 oz
Information source - - Manufacturers Literature   Undated data sheets
-- Original prospect or advert   Electronics, June 1938
Taschenbuch zum Röhren-Codex 1948/49

254_so.png 254: ARRL Handbook 1972
Anonymous 10 Collector

Just Qvigstad
254: Fin Stewart
Fin Stewart

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