H.F. Unit

Mullard Wireless, London (see also Mullard Radio Valve)

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  • Year
  • 1928
  • Category
  • Kit (Parts plus instruction) or building instructions only
  • Radiomuseum.org ID
  • 231359

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

 Technical Specifications

  • Number of Tubes
  • 1
  • Main principle
  • RF-Circuit or wave trap (separate, can also be an antenna with amp.)
  • Tuned circuits
  • 1 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Storage and/or dry batteries / 120 & 2 Volt
  • Loudspeaker
  • - - No sound reproduction output.
  • Material
  • Special material, described in the notes.
  • from Radiomuseum.org
  • Model: H.F. Unit - Mullard Wireless, London see
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • A tuned RF premap to add to the Mullard Master Three or Mullard Master Three Star. Presumed to use same valve/tube as the RF on the Master Three Star.

    "Blueprint" supplied loose in "Radio for the Million" Vol2 No 4 1928 (1/- = 0.05 GBP), which lists parts (except the valve!) and gives wiring instructions. Has Neutralisation adjustment. Five page article. Note that in this period MW is described as "Short Waves".

    Schematic from booklet is simplified by omitting the LW/MW coil connections and switching, the text warns to switch the Master Three (either model) and H.F. Unit both to same band.

    Text discusses an ebonite front panel. Baseboard is specified as 5 ply 6" x 10" but this may be to accomodate the main receiver as 6" x 7" x  10" cabinet is recommended.

  • Price in first year of sale
  • 0.05 GBP
  • Literature/Schematics (1)
  • "Radio for the Million" Vol2 No 4 1928
  • Author
  • Model page created by Michael Watterson. See "Data change" for further contributors.

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