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ID = 4420
Tube type:  Vacuum Pentode 
Identical to 4DT6A
Similar Tubes
Heater different:
  3DT6A ; 6DT6A

Base Miniatur-7-Pin-Base B7G, USA 1940
Filament Vf 4.2 Volts / If 0.45 Ampere / Indirect
Information source Essential Characteristics, GE 1973   
  4DT6A: Manufacturer's Literature
Emilio Ciardiello
4DT6A: My personal collection
Robert Sarbell

More ...
4DT6A: RTT Schwandt
Günther Stabe † 19.8.20

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4DT6A: RCA Tube Manual
Peter Hoddow

from Just Qvigstad

Usage in Models 1= 1965?? ; 1= 1969?? ; 1= 1970

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

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