Trophy 6

Peto Scott Co. Ltd. & British Radio Gramophone Co. Ltd.; London

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  • Year
  • 1940
  • Category
  • Commercial Receiver (may include amateur bands)
  • Radiomuseum.org ID
  • 115701

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

 Technical Specifications

  • Number of Tubes
  • 6
  • Main principle
  • Superheterodyne (common); ZF/IF 458 kHz; 2 AF stage(s)
  • Tuned circuits
  • 6 AM circuit(s)
  • Wave bands
  • Broadcast and Short Wave (SW).
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Metal case
  • from Radiomuseum.org
  • Model: Trophy 6 - Peto Scott Co. Ltd. & British
  • Shape
  • Tablemodel, with any shape - general.
  • Notes

  • The Peto Scott Trophy 6 was a communication-type superheterodyne receiver, designed for serious amateur and semi-professional use. It featured four valves plus a rectifier and a beat frequency oscillator (BFO), with a price of £10 19s. 6d. (or £12 9s. 6d. with vibrator provision for battery operation).

    Note:
    There is no evidence in the information available to date to suggest that the Trophy 6 was produced in collaboration with or under the BTS brand, unlike earlier Trophy models.

    Wave Ranges
    The receiver covers four continuous, overlapping wavebands:

    • 46–15 Mc/s (6.5–20 metres)
    • 17–5.5 Mc/s (17.65–54.5 metres)
    • 5.5–1.7 Mc/s (54.5–176.5 metres)
    • 1700–550 kc/s (176.5–545 metres)

    Circuit Design

    • Front End:
      • A single tuned circuit is placed before the triode-hexode frequency changer (mixer/oscillator), inductively coupled to the aerial.
      • There is provision for a doublet aerial system to maximize efficiency on a chosen wavelength.
    • Intermediate Frequency (IF) Stage:
      • Single IF amplifier stage.
      • Iron-cored input transformer and air-cored output transformer.
      • Automatic Volume Control (AVC) is derived from a common load resistance after filtering, with delayed action.
      • AVC voltage is applied to the frequency changer and IF stage on all bands but can be switched off for weak signals or Morse reception.
      • On the highest frequency band (6.5–20 metres), IF valve bias is reduced for additional gain.
    • Detection and Audio:
      • Signal rectification via a single diode (anodes strapped).
      • Triode section of the detector is resistance-coupled to a tetrode output valve.
      • Switch jack in output circuit allows headphone use through a condenser, with the output transformer’s primary acting as a choke.
    • Power Supply:
      • AC mains operation; optional vibrator unit for 6V battery operation (delivers 70 mA at 250V).
      • Filaments fed directly; HT current smoothed by loudspeaker field.
      • Decoupling provided only for the screens of the frequency changer and IF valves.
    • Beat Frequency Oscillator (BFO):
      • Included for Morse code (CW) reception.
      • Front panel adjustment for local oscillator to set BFO beat to user preference.
    • Bandspread Tuning:
      • Two-gang bandspread condenser added to the main tuning condenser.
      • Bandspread dial allows fine, precise tuning, especially on shortwave.
  • Price in first year of sale
  • 11.00 GBP
  • Author
  • Model page created by Mario Coelho. See "Data change" for further contributors.

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