Television T20

Ultra Electric Ltd.; London

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  • Year
  • 1937–1939
  • Category
  • Television Receiver (TV) or Monitor
  • Radiomuseum.org ID
  • 345200
    • alternative name: Ultra Radio and Television

 Technical Specifications

  • Number of Tubes
  • 15
  • Valves / Tubes
  • Main principle
  • Superhet with RF-stage
  • Wave bands
  • VHF incl. FM and/or UHF (see notes for details)
  • Power type and voltage
  • Line (AC, UC or DC not known) / 200-250 Volt
  • Loudspeaker
  • -Loudspeaker incorporated, but system not known.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Television T20 - Ultra Electric Ltd.; London
  • Shape
  • Console with any shape - in general
  • Notes

  • T20, a low-priced Television Receiver for sound and vision only, with a picture size of 7¾” by 6¼”. Ediswan all-magnetic cathode-ray tube.

    The apparatus commences with an RF stage, and then there is a triode-hexode frequency changer followed by two IF stages, after which the path of the signal is split. The sound signal is picked out and passed through another IF stage at 2.6 Mc/s, and thence to a duo-diode output pentode.

    The vision signal also goes through another IF valve, the frequency being 6.1 Mc/s, which feeds a low-capacity diode detector. Single-sideband reception is adopted.

    This valve is followed by a vision-frequency amplifier having a response characteristic which is substantially flat up to 2.25 Mc /s. Magnetic deflection and focusing are used and the time bases include power pentodes in their output circuits.

    Wireless World Aug 20, 1937, Page 171.

  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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