21

Briton Electrical & Radio Pty. Ltd ("Rational Radio"); Sydney, NSW.

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  • Year
  • 1937
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 167209

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

 Technical Specifications

  • Number of Tubes
  • 5
  • Number of Transistors
  • Main principle
  • Superhet with RF-stage; ZF/IF 462.5 kHz; 2 AF stage(s)
  • Tuned circuits
  • 7 AM circuit(s)
  • Wave bands
  • Broadcast and Short Wave (SW).
  • Power type and voltage
  • Storage Battery for all (e.g. for car radios and amateur radios) / 6 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 21 - Briton Electrical & Radio Pty.
  • Shape
  • Console, Lowboy (legs < 50 %).
  • Notes

  • 5 valve, dualwave superhet powered from a 6 volt battery.

    Of primary interest to the countryman is model 21, designed for vibrator operation. The performance is quite on a parallel with the A.C. model, and the vibrator cannot be heard in action It was found that an earth connection was necessary to ensure absolute vibrator silence, but even minus the earth there is only the faintest trace of the power unit in action, even at 16 metres. Two-volt battery valves are employed, IC4 (R.F.). KK2 (octode frequency converter), IC4 (1.F.), IK6 (duo-diode-pentode demodulator) and IF4 (pentode). The speaker is a Magnavox 254 M of permag. type.
    Power for the whole receiver is taken from a six-volt accumulator (this being the voltage necessary with any vibrator unit), and the vibrator is housed in a rubber-mounted metal box on the bottom shelf of the cabinet away from the chassis. Dial lamps are switched off as required by an alternative position of the wave-change switch, which is also combined to switch the receiver on and off. In action this receiver consumes under one ampere. It sells at 36 guineas.
    The Bulletin Sep 22, 1937, Page 41

  • Price in first year of sale
  • 36.00 Aus£
  • Circuit diagram reference
  • Australian Official Radio Service Manual Vol. I I
  • Author
  • Model page created by Stuart Irwin. See "Data change" for further contributors.

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