All-Wave Superheterodyne S620

Faraday All-wave Wireless Company Ltd.; London

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  • Year
  • 1932 ?
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 360621

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

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Superhet with RF-stage; Anode bend detection
  • Wave bands
  • Broadcast, Long Wave and 2 x Short Wave.
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: All-Wave Superheterodyne S620 - Faraday All-wave Wireless
  • Shape
  • Tablemodel, high profile (upright - NOT Cathedral nor decorative).
  • Notes

  • The Faraday All-Wave Superheterodyne Model S620, as advertised in Wireless World on October 28, 1932, is a groundbreaking radio receiver designed to attract the British listening public, both domestically and overseas, to the intriguing possibilities of broadcasting. It combines the ability to receive both normal and short wavelengths with the simplicity and ease of operation typical of standard domestic receivers. Externally, it resembles a conventional mains-operated broadcast receiver, complete with a built-in loudspeaker. However, it includes provisions for receiving transmissions across medium and long wavebands and shortwave frequencies between 15 and 60 meters.

    Technical Features
    Circuit Design
    The receiver incorporates a unique circuit arrangement. The high-frequency (H.F.) stage up to the intervalve coupling employs single-tuned circuits. Its frequency changer uses a tuned intervalve coupling linked by a common resistance, maintaining a frequency difference of 115 kHz through a padding condenser. On long waves, alignment is achieved with an additional trimming condenser. For short-wave bands, the H.F. stage becomes aperiodic, and adjustments are made automatically via a ganged wave range switch.

    The detector-oscillator connects to the intermediate frequency (I.F.) amplifier through double-tuned band-pass filters. A self-biased detector feeds the output pentode via resistance-capacity coupling. A high-note attenuator can be activated using a switch for enhanced sound quality.

    Tone Correction
    To address potential shrillness in gramophone record playback due to high-note loss in tuned circuits, the pentode output valve acts as an automatic tone corrector. Additionally, the volume control potentiometer functions as a variable shunt for the pick-up.

    Specifications

    Feature Details
    ​Type Self-contained five-valve superheterodyne with moving-coil loudspeaker
    ​Operation A.C. mains with external or mains aerial; D.C. model available
    Wave Ranges Short (15–30 m), Long-short (30–69 m), Medium (215–550 m), Long (550–2000 m)
    ​Additional Features Gramophone pick-up provision
    Circuit Signal-frequency H.F. stage; combined detector-oscillator; one I.F. stage; resistance-coupled output pentode
    ​Controls Single-knob tuning, 4-position wave range switch, combined volume control/on-off switch, tone control switch
    ​Price 27 guineas; Overseas models: £30 (Walnut cabinet), £32 (Teak cabinet)

    Summary
    The Faraday All-Wave Superheterodyne Model S620 is an innovative radio receiver combining advanced technical design with user-friendly controls. Its ability to receive multiple wavebands and its thoughtful features make it ideal for both domestic and overseas broadcasting enthusiasts.

    For comparison, see the later version, Model S620L (1933).

  • Price in first year of sale
  • 27.00 GNS
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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