854

McMichael Radio Ltd.; Slough

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  • Year
  • 1953 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 104413
    • alternative name: McMichael, Leslie

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

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • Superheterodyne (common); ZF/IF 470 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast, Long Wave and Short Wave.
  • Power type and voltage
  • AC/DC-set / 190-250 Volt
  • Loudspeaker
  • Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 6 inch = 15.2 cm
  • from Radiomuseum.org
  • Model: 854 - McMichael Radio Ltd.; Slough
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • See also the revised 854A (lower power consumption), perhaps following year, different circuit as well as series AC/DC tubes/valves and operation (100mA heaters). Unusually this model though all 6.3V types apart from PY82 rectifier is series connected heaters (300mA), prossibly because the 113 (same chassis) is used in CR53 and CR317 TV models.

    The three pilot/scale lamp/bulbs are 300mA types in series betweeen chassis and mains supply, so even if "neutral" is to the pilot lamps and "live" to dropper resistor/PY82 the chassis is live if a lamp fails.

    Transformer isolated external speaker socket but Aerial and Earth sockets are only capacitor isolated from live mains so should be safety Y2 types.

  • Mentioned in
  • -- Original-techn. papers.
  • Author
  • Model page created by Peter Hoddow. See "Data change" for further contributors.

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