• Year
  • 1938/1939
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 172125

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Tubes
  • 8
  • Main principle
  • Superhet with RF-stage; ZF/IF 456 kHz; 3 AF stage(s)
  • Tuned circuits
  • 9 AM circuit(s)
  • Wave bands
  • Broadcast plus 2 Short Wave bands.
  • Power type and voltage
  • Storage and/or dry batteries / 6 & -1.5 & -3 & -4.5 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Columbus 77B - Columbus Brand; Radio Centre
  • Shape
  • Console, Lowboy (legs < 50 %).
  • Notes
  • This model used a synchronous vibrator power unit. The 6E5 heater and the dial lights are separately switched. There is an "economy" switch which increases the bias on the 30 and 19 valves.
  • Circuit diagram reference
  • Australian Official Radio Service Manual Vol. I I
  • Literature/Schematics (1)
  • Mingay's Radio Diagram & I.F. Index
  • Author
  • Model page created by Stuart Irwin. See "Data change" for further contributors.

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