Thorn Studio 503 Ambiophonic

MRI Thorn (Brand) Mowat Radio Industries Ltd; Thorn Radio Industries Ltd; Mangere Bridge Auckland

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  • Year
  • 1975
  • Category
  • Broadcast Receiver - or past WW2 Tuner
  • Radiomuseum.org ID
  • 357121

 Technical Specifications

  • Number of Transistors
  • 26
  • Semiconductors
  • Main principle
  • Superheterodyne (common); ZF/IF 455 kHz
  • Wave bands
  • Broadcast only (MW).
  • Details
  • Record Player (not changer)
  • Power type and voltage
  • Alternating Current supply (AC) / 50Hz, 230 Volt
  • Loudspeaker
  • 2 Loudspeakers
  • Power out
  • 40 W (max.)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Thorn Studio 503 Ambiophonic - MRI Thorn Brand Mowat Radio
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • Thorn Studio 503 Ambiophonic stereo system with broadcast (MW) tuner, 2x 20W stereo amplifier, Garrard SP25 Mk IV record player, and two Studio 500 Model 71ZS front speaker units. 

    Ambiophonic sound system (Used with optional rear speakers).

    The rear speakers are connected to the front speakers in a bridge configuration. This means that the rear speakers reproduce any phase shift applied to the front speakers, but they do not reproduce any other audio signal.

    This configuration is used to create the illusion of sound coming from the rear speakers. By applying a phase shift to the audio signal sent to the rear speakers, the system can create a sense of sound directionality. This is because the human brain interprets the phase difference between the audio signals from the left and right ears to determine the direction of a sound source.

    Specifications:

    • Power Output: 20 watts. per channel.
    •  Frequency Response: 30 Hz— 20 kHz+ 1 dB using tape input.
    •  Power Bandwidth: 30Hz — 20 kHz unclipped at — 2 dB points
    •  Distortion: Less than 0.1% up to 1 dB below maximum power output.
    •  Magnetic pickup
    •  Tape input
    •  Auxiliary input
    •  Power Consumption: 75 watts from nominal 230V (215-245V) AC 50 Hz. Supply.
    •  Semi-conductor Complement: 26 Transistors, 10 Diodes
    •  Tone Controls: (Reference 0 dB at 1 kHz) Bass = 12 dB at 40 Hz Treble + 12 dB at 10 kHz
    •  Contour: (at 30 dB below full volume setting). + 9 dB at 40 Hz, + 7 dB at 10 kHz
    •  Low Filter:— 20 dB at 20 Hz
    •  High Filter:— 10 dB at 10 kHz
    •  Crosstalk: Better than 40 dB at 1 kHz for any input.

    See also Thorn 504 Ambiophonic 500 Series. 

  • Mentioned in
  • -- Original prospect or advert (Press 25 November 1976 Page 23)
  • Author
  • Model page created by Brian Stevens. See "Data change" for further contributors.

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