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ID = 22217
Tube type:  Full-Wave Vacuum Rectifier 
Identical to 5R4GB
Similar Tubes
Other shape (e.g. bulb type):
Other class quality (otherwise equal):
  5R4GYB ; 5R4WGB

Base Octal (Int.Octal, IO) K8A, USA 1935
Filament Vf 5 Volts / If 2 Ampere / Direct /
Tube prices 1 Tube prices (visible for members only)

5R4GB: own tube collection
Hannu Alho

5R4GB: RCA Tube Manual
Peter Hoddow

5R4GB: RCA Tube Manual
Peter Hoddow

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