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ID = 18985
United States of America (USA)
Brand: DeForest-Tubes
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Transmitting Triode, air cooled   Power/Output 
  Ca. 1925 up to 1945 very rare. ***
Identical to 552 = UX852
Similar Tubes
Normally replaceable-slightly different:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Sidecontact and top contact.
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3.25 Ampere / Direct / Specified voltage AC/DC

Deforest Radiotron
Mit Bajonettstift.
100W, 30MHz.

Dimensions (WHD)
incl. pins / tip
135 x 190 x 95 mm / 5.31 x 7.48 x 3.74 inch
Weight 175 g / 6.17 oz
Information source Vintage Radio 1887-1929, Greenwood's Classic Pictorial Album   
Tube Lore (II)   p. 199
552: O.F.
Otto Frosinn

More ...
552: Fin Stewart
Fin Stewart

552: DeForest DataSheet
Franz Scharner

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