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ID = 5283
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to 12AT6A
Similar Tubes
Normally replaceable-slightly different:
First Source (s)
12.Jun.1961 : Electron Tube Registration List
Predecessor Tubes 12AT6  

Base Miniatur-7-Pin-Base B7G, USA 1940
Was used by Radio/TV-reception etc.
Filament Vf 12.6 Volts / If 0.15 Ampere / Indirect / Specified voltage AND current AC/DC

Controlled warm-up time, for improved series heater operation. Other specs identical to those of 12AT6.

Information source Essential Characteristics, GE 1973   

12at6a_sockel.png 12AT6A: Essential characteristics
Peter Hoddow

Just Qvigstad
12AT6A: Manufacturer's Literature
Emilio Ciardiello

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