Kilodyne Four 1935 Battery

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

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  • Year
  • 1935 ?
  • Category
  • Kit (Parts plus instruction) or building instructions only
  • Radiomuseum.org ID
  • 111462

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

 Technical Specifications

  • Number of Tubes
  • 4
  • Main principle
  • TRF with regeneration
  • Wave bands
  • Broadcast and Short Wave (SW).
  • Power type and voltage
  • Storage and/or dry batteries / 2 / 135-150 Volt
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: Kilodyne Four 1935 [Battery] - Eddystone Brand, Stratton and
  • Shape
  • Chassis only or for «building in»
  • Notes

  • Kilodyne Four 1935
    A Powerful 4 Valve Short Wave Receiver
    With Broadcast Bands Adaption
    Battery Model, 13-2000 Metres

    Only those who have handled the new 1935 Kilodyne can appreciate its wonderful capabilities. Unlike many " All Wave " receivers, the Kilodyne is not an ordinary set adapted afterwards for shortwave working, but an instrument designed for efficient shortwave reception as a first consideration and adapted later for the higher wavelengths. The features of the design are ease of operation, excellent slow-motion open vision tuning control, freedom from objectionable body capacity effects, even on the shortest waves, no spots in any wave range, and smooth and definite reaction everywhere. Ideal for the reception of the British Empire station programs.

    The 1933/34 Kilodyne has proved so successful that the 1935 model incorporates most of its features. There are, however, a number of improvements that have been added and have still further added to its capabilities. The screened grid valve has now been replaced by one of the new variable-mu pentodes and a variable potentiometer giving variable bias to this valve is fitted, so that an effective selectivity control is available. The high-frequency chokes have been replaced with a new screened type and a Ferranti transformer replaces the one previously used.

    The set gives loudspeaker results from all the main shortwave stations in the world and is extremely simple to operate. Reaction is smooth and there is no trace of hand capacity effects. Tuning is by one dial only with an open vision scale and slow-motion ratio. From the theoretical diagram, it will be seen that the aerial stage consists of a high frequency choke in the grid circuit of the high-frequency valve.

    The full advantage of the characteristics of the high-frequency valve is, however, obtained by means of the high-frequency transformer with tuned secondary winding which couples this valve to the detector. The transformer incorporates a reaction winding which is fed from the detector plate by the Reinartz method. The detector valve is of the metallised type with leaky grid detection and is coupled to the first L.F. valve by means of a resistance coupling stage. The values of this stage are so arranged that maximum use of the amplification factor of the valve is obtained. The first L.F. valve is of the high amplification type and is followed by a Ferranti AF4 transformer, which feeds the final output valve. This last valve is a high amplification pentode. It should be appreciated that the Kilodyne has been primarily designed for shortwave reception and although the selectivity on the broadcast band is good, it is not equal to a receiver employing many tuned circuits.

    The price for 1936 battery model was £6 19s 6d, valves £2 1s 0d, & for optional external permanent dynamic speaker £4 10s 0d.

    Also available as an AC Mains version.

  • Price in first year of sale
  • 6.98 GB £
  • Mentioned in
  • Quick Reference Guide, Eddystone User Group
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Eddystone Shortwave Manual No. 2)
  • Literature/Schematics (2)
  • -- Original prospect or advert (Wireless Magazine Nov 1935, Page 381.)
  • Author
  • Model page created by Martin Bösch. See "Data change" for further contributors.

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