D28RG

Murphy Radio Ltd.; Welwyn Garden City

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  • Year
  • 1935
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 336444

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

 Technical Specifications

  • Number of Tubes
  • 8
  • Main principle
  • Superheterodyne (common); ZF/IF 119 kHz
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Details
  • Record Player (not changer)
  • Power type and voltage
  • AC/DC-set / 240 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: D28RG - Murphy Radio Ltd.; Welwyn
  • Shape
  • Console, Lowboy (legs < 50 %).
  • Notes

  • 8-valve, AC/DC-powered, superhet radiogram with AFC and dynamic noise suppression.

    The superheterodyne circuit comprises a signal-frequency HF amplifier, frequency changer, IF stage, double-diode rectifier and AVC valve, LF amplifier with tone correction and inter-station noise suppression, and a pentode output valve.

    There are, in addition, two valves, whose special function is to correct reasonable errors of tuning on the part of the user. They are a double diode rectifier and a pentode valve arranged to shift slightly the tracking of the oscillator in the event of careless adjustment of the tuning control. There should be little excuse for inaccurate tuning, however, for the new tuning scale, let into the top of the cabinet, is of an improved type, quite free from parallax errors.

    The medium and longwave pointers work in slots in the same plane as the scale, which, in addition to wavelength calibrations, now carries a selection of station names.
    Wireless Word, August 30, 1935 Advertisement Page 259.

    For the noise reduction description, see Forum Article.

    The cabinet of Indian Laurel, Walnut & Pear Tree veneers.

  • Price in first year of sale
  • 24.75 GB £
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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