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ID = 12725
Brand: Mazda (tubes), Mazda-Belvu, Compagnie des Lampes; Paris
Developer: Westinghouse El. & Mfg. Co. - see also Canadian W. 
Tube type:  Screen-grid Tetrode   Universal 
Identical to EY624 = 24 = UY224 = C324
Similar Tubes
Normally replaceable-slightly different:

Base UY-Base, 5 Pins (USA, April 1927) (Codex=Ha) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2.5 Volts / If 1.75 Ampere / Indirect / Specified voltage AC/DC

Schirmgitter: 90V und 1,7 mA; S = 1,05 mA/V; Ri= 600 kOhm

Information source Taschenbuch zum Röhren-Codex 1948/49   Universal Vademecum 1960
-- Collector info (Sammler)   
EY624: W.E.
Wolfgang Eckardt

EY624: ARRL Handbook 1972
Michael Schlör

EY624: j.tavares
Jorge Tavares

from Just Qvigstad

Usage in Models 1= 1932 ; 1= 1933??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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