623

Armstrong Audio / Wireless & Television / Manufacturing; London

Data
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  • Year
  • 1973 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 251390

 Technical Specifications

  • Number of Transistors
  • Semiconductors present.
  • Semiconductors
  • Main principle
  • Superhet, double/triple conversion; ZF/IF 455/3000/10500 kHz
  • Wave bands
  • Broadcast, Long Wave and FM or UHF.
  • Details
  • Hi-Fi equipment
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: 623 - Armstrong Audio / Wireless &
  • Shape
  • Tablemodel with Push Buttons.
  • Notes

  • Double Conversion on AM. The high (3MHz) 1st IF allows LW & MW on one band.

    Varicap tuning. Unusually the upper mechanical meter is the varicap tuning voltage, not AGC or FM tuning AFC. The lower meter has a button to select signal level or AFC error (centre zero is perfect tuning).

    Six preset stations (preset by small multiturn potentiometers), 3 for AM and 3 for FM.

    Stereo Multiplex decoder for VHF-FM (87.5 .. 108 MHz)

    The rear 5 pin DIN connector has a choice of two levels:

    1. Left hand channel output, high level
    2. Ground (earth) connection
    3. Left hand channel output, low level
    4. Right hand channel output, high level
    5. Right hand channel output, low level

    (note 1 & 3 are outer pins and 2 is middle with 4 & 5 on either side)

    Part of the "600" series:

    •     602 Loudspeaker
    •     621 Amplifier
    •     623 AM/FM Tuner
    •     624 FM Tuner
    •     625 FM Receiver
    •     626 AM/FM Receiver
  • Author
  • Model page created by Oron Cherry. See "Data change" for further contributors.

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The model is part of the collections of the following members.

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