Ultra Twin R656

Ultra Electric Ltd.; London

Data
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  • Year
  • 1950
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 96335
    • alternative name: Ultra Radio and Television

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • Superheterodyne (common); ZF/IF 470 kHz
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Line / Batteries (any type) / 200-214; 215-234; 235-250 / 7,5 & 85 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 5 inch = 12.7 cm
  • Material
  • Bakelite or Plastics (type unknown)
  • from Radiomuseum.org
  • Model: Ultra Twin R656 - Ultra Electric Ltd.; London
  • Shape
  • Portable set > 8 inch (also usable without mains)
  • Dimensions (WHD)
  • 12 x 8.5 x 6.5 inch / 305 x 216 x 165 mm
  • Notes

  • Uses an S.T.C DRM 2B as rectifier.
    Rear panel has an external aerial socket.

    A lever on a spring loaded slide switch locks the radio in the "battery" mode when the mains plug is parked in a holder. This was to suit a UK 5A two pin and some smaller 5A 3 pin prior to the 3 rectangular pin system adopted in the late 1950s. The chassis is also connected directly to one wire of the mains cable when in "mains" mode (default) and power switch on. Today the set is best operated via an external isolation transformer or on batteries.
    There is an external aerial socket isolated by a Silver Mica capacitor.

    This Twin uses separate batteries (Presume B129 and AD39 as claimed by trader 963 for Twin 50). A  B126 + AD38 will physically connect, but B126 is 90V and the label clearly states 85V. A B129 and AD39 fit snugly.

    If the radio has one battery plug, then it's the Twin 50 R568 or some other Twin as  R&TS states this uses a combined battery. Presumed to be B127 (size & rating and claimed by Trader 963).

  • Price in first year of sale
  • 236.00 Hfl
  • Author
  • Model page created by John Koster. See "Data change" for further contributors.

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