Kilodyne Four

Eddystone (Brand), Stratton and Co., Ltd., Eddystone Radio Ltd.; Birmingham

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  • Year
  • 1931
  • Category
  • Kit (Parts plus instruction) or building instructions only
  • Radiomuseum.org ID
  • 111064

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

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • TRF with regeneration; Screengrid 1926-1935
  • Wave bands
  • Broadcast, Long Wave and Short Wave.
  • Power type and voltage
  • Storage and/or dry batteries / 2 / 70-80 / 100-120 / 120-150 Volt
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: Kilodyne Four - Eddystone Brand, Stratton and
  • Shape
  • Chassis only or for «building in»
  • Notes

  • The Kilodyne is a well thought out four valver specially made for the reception of all wavelengths between 12.5 and 85 metres, but also possesses the advantage of being adaptable by the use of extra coils for tuning in stations in any waveband up to 1,800 metres.

    The construction of the receiver has been greatly simplified by the use of a perfectly straight circuit. The aperiodic aerial stage consists of a high-frequency choke between the grid of the screen-grid valve and earth. This valve is coupled to the detector by means of a high-frequency transformer, of which only the secondary is tuned with a .00016 low-loss condenser. (It is thus possible to adopt an untuned aerial circuit with success and to reduce the tuning controls to a bare minimum of one. With such an efficient form of coupling, selectivity is very good, as there is only a light damping due to the load of the secondary winding on the detector valve. To obtain reaction, a winding is fed from the detector plate to the high-frequency transformer by the Reinartz method. Leaky grid detection has been employed. The metallised detector is followed by one low-frequency (resistance-coupled) stage, using a valve of high amplification type and a Ferranti AF8 'transformer feeding a pentode output valve.

    From this description, you will see that the " Eddystone Kilodyne Four " represents a powerful receiver, capable in many instances of giving loud-speaker reception of the most important short-wave broadcasts.

    Receiver sold as kit primarily designed for shortwave reception, with optional (2,5" vertical plug-in type) coils also LW / MW.
    The form is a metal chassis with an attached metal front plate.

    The 1932 price was £6.75 with coils for 12.5 to 85m, but excluding valves/tubes.

    Also available as an AC version.

     

  • Mentioned in
  • Quick Reference Guide, Eddystone User Group
  • Literature/Schematics (1)
  • -- Original prospect or advert (Practical Wireless Dec 24, 1932, Page 686)
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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