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ID = 5284
Tube type:  Vacuum Pentode   RF/IF-Stage 
Identical to 12AU6A
Similar Tubes
Normally replaceable-slightly different:
  12AU6 ; 8426 ; 8426A
First Source (s)
12.Jun.1961 : Electron Tube Registration List

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 version of 12AU6 for operation in 150 mA series heater strings.

Information source Essential Characteristics, GE 1973   

7bk_res~~1.png 12AU6A: Manufacturer's Literature
Emilio Ciardiello

12AU6A: Manufacturer's Literature
Emilio Ciardiello

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