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Information - Help 
ID = 16625
United States of America (USA)
Brand: Amperex; New York
Developer: Amperex; New York 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to ZB120 = 3C21 = 38220

Base Jumbo 4-pin bayonet (1918) (Codex=Byy)
Was used by Radio/TV-reception etc.
Filament Vf 10 Volts / If 2 Ampere / Direct / Specified voltage AND current AC/DC

This tube was developed by Amperex and is listed as a low distortion zero bias Class B Amplifier and Modulator and as a high efficiency RF multiplying power amplifier and conventional RF power amplifier. It has an amplification factor of 90 and DC plate voltage of 750 - 1500. First announced in QST magazine February 1937

Dimensions (WHD)
incl. pins / tip
x 172 x 54 mm / x 6.77 x 2.13 inch
Information source Tube Lore (II)   p. 150
Tube Lore (I)   
-- Original-techn. papers.
Taschenbuch zum Röhren-Codex 1948/49

ZB120: Mfg. data sheet
Jay Kinnard

zb120_so.png ZB120: ARRL Handbook 1972
Anonymous 10 Collector

Just Qvigstad
ZB120: Manufacturer's Literature
Emilio Ciardiello

More ...
Usage in Models 1= 1937

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1


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