3 BR-5 Converter 3 BR-5

Morrow Radio Mfg. Co., Moradco; Salem (OR)

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  • Year
  • 1956 ??
  • Category
  • Amateur Equipment (Other, but not Key)
  • Radiomuseum.org ID
  • 329972

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • RF Converter/Adapter (not voltage converter)
  • Wave bands
  • Wave Bands given in the notes.
  • Power type and voltage
  • Powered by external power supply or a main unit. / 6 or 12 and 200 - 250 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: 3 BR-5 Converter 3 BR-5 - Morrow Radio Mfg. Co., Moradco
  • Shape
  • Very small Portable or Pocket-Set (Handheld) < 8 inch.
  • Notes

  • The Morrow 3 BR-5 converter covers the 10, 20, and 75 meter ham bands.  A 3-gang variable capacitor tunes the RF amp, mixer, and oscillator. It was designed for mobile ham band reception using an automobile radio as a fixed IF at 1525 KHz. The converter uses a 6AB6 as RF amplifier, a 12AT7 as oscillator, a second 6AB6 as mixer, and a 6AL5 as noise limiter (to reduce impulse car ignition noise). Power requirements are for 200 to 250 Volts B+ at 20 to 25 mA supplied from an external source, typically the car radio itself, and 6 Volts for filament power. The filament supply can be changed to 12 volts if a 12 volt pilot lamp and a 12AL5 are substituted and the remaining filaments jumpered for series connection.  The set is similar to the 5BRF but covers fewer bands.

  • Author
  • Model page created by Rich Post. See "Data change" for further contributors.

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