570

Invicta Radio Ltd.; Cambridge, London

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  • Year
  • 1938
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 201850

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 465 kHz; 1 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast, Long Wave and Short Wave.
  • Power type and voltage
  • Alternating Current supply (AC) / 200-250 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil) / Ø 8 inch = 20.3 cm
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 570 - Invicta Radio Ltd.; Cambridge,
  • Shape
  • Tablemodel with Push Buttons.
  • Dimensions (WHD)
  • 16.125 x 19.5 x 10.5 inch / 410 x 495 x 267 mm
  • Notes

  • 8 push buttons, 3 for wavebands, 5 for pre-set radio stations.

    Four colour edge lit tuning scale using two lamps.

    Two LW preset and three MW presets. The suffix A, B, C or D indicates factory tuned options. S is customer instructions. Each button has a limited tuning range. Oscillator is Permeability tuned and RF capacitance tuned for Preset stations.

    Models A & C use different set of coils / capacitors for 2nd and 3rd MW presets to models B & D. 203 ..300m & 290 .. 420m vs 380 ,, 540m on both buttons.

    Wavebands

    • LW: 900 .. 2100 m
    • MW 200 .. 560 m
    • SW 16 .. 52m

    PU (Gram) and Loudspeaker sockets (2 Ohm).

    Standard model is 200 to 250V 40Hz to 100Hz. See notes on Invicta 430 about possible options.Listed with technical details but not illustrated in 1938 Brochure which only lists TH4A, the Trader 379 is January 1939 and gives TH4B as alternate.

     

  • Source of data
  • - - Manufacturers Literature
  • Author
  • Model page created by Howard Craven. See "Data change" for further contributors.

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