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ID = 7666
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to CV1575 = VU71A
Similar Tubes
Normally replaceable-slightly different:
  5U4GB ; 5U4GBEH

Base Octal (Int.Octal, IO) K8A, USA 1935 (Codex=Vy)
Was used by Military and/or Government
Filament Vf 5 Volts / If 3 Ampere / Direct / Parallel, (AC/DC)

500V max rms, 250mA max DC.

Literature Taschenbuch zum Röhren-Codex 1948/49   
CV1575: ARRL Handbook 1972
Michael Schlör

CV1575: Manufacturer's Literature
Emilio Ciardiello

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