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ID = 5603
Tube type:  Damper, booster, flyback diode 
Identical to 19AU4 = 19AU4GT
Similar Tubes
Normally replaceable-slightly different:
Heater different:

Base Octal (Int.Octal, IO) K8A, USA 1935
Was used by Radio/TV-reception etc.
Filament Vf 18.9 Volts / If 0.6 Ampere / Indirect / Series, AC/DC
Information source Essential Characteristics, GE 1973   
  19AU4: Courtesy Bureau Belper (De Muiderkring, Bussum), Scan Frank Philipse
Karel De Reus †
19AU4: Photo of tube from my collection - TS
Tomasz Szczesniak

19AU4: RTT Schwandt
Günther Stabe

19AU4: RCA Manual RC-21
Heinz Höger

from Just Qvigstad

Usage in Models 9= 1956? ; 24= 1956 ; 92= 1957? ; 87= 1957 ; 6= 1958? ; 6= 1958

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):224

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