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Information - Help 
ID = 71231
Brand: Fivre - tubes; Milano (MI)
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Vacuum Pentode   RF/IF-Stage 
Identical to 1851GT
Similar Tubes
Other shape (e.g. bulb type):
  1851 ; R219
Other base and data slightly different:

Base Octal (Int.Octal, IO) K8A, USA 1935 Top contact with a cap.
Filament Vf 6.3 Volts / If 0.45 Ampere / Indirect / Specified voltage AC/DC

Television RF/IF pentode. 300V max plate, 150V max screen, 9000 micromhos Gm. Small control grid top cap.

Dimensions (WHD)
incl. pins / tip
x 90 x 33 mm / x 3.54 x 1.30 inch
Information source - - Manufacturers Literature   
1851GT: Catalogue Fivre
Patrice Zeissloff

1851GT: catalogo FIVRE
Tonino Giagnacovo

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