Kilodyne Four 1935 AC Mains

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
  • 111463

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

 Technical Specifications

  • Number of Tubes
  • 5
  • Main principle
  • TRF with regeneration
  • Wave bands
  • Broadcast and Short Wave (SW).
  • Power type and voltage
  • Alternating Current supply (AC) / 230 Volt
  • Loudspeaker
  • Electro Magnetic Dynamic LS (moving-coil with field excitation coil)
  • Material
  • Metal case, TUBES VISIBLE
  • from Radiomuseum.org
  • Model: Kilodyne Four 1935 [AC Mains] - Eddystone Brand, Stratton and
  • Shape
  • Chassis only or for «building in»
  • Notes

  • All-Electric Kilodyne 1935
    An All-Electric Short Wave Receiver for A.C. Mains Operation
    With Moving Coil Loudspeaker.
    13.5 - 2,000 Metres.

    The 1935 all-electric Kilodyne resembles the battery model in circuit design as far as the receiving portion is concerned. It incorporates, however, additional provisions for supplying high and low tension to the A.C. valves. This entails quite a considerable number of additional components and care in the general design is essential if really first class shortwave results are to be obtained.

    Much time has been expended on the present design and the result is a set which is free from hum, which works efficiently over all wavebands and gives a smooth reaction. The layout of the components is critical and the design shown should be carefully followed. The whole of the receiver is built on a diecast aluminium chassis which gives strength and rigidity to the finished assembly.

    The mains transformer is a particularly well-designed and massive component so that good regulation without overheating is assured. Good regulation is very important as far as valve life is concerned.

    The high-tension winding of the transformer gives 350-0-350v. output. The speaker field is used as a smoothing choke, this has a resistance of 2,750 ohms and gives 110v. drop so that the voltage to the set is 250v. The speaker field is connected in the negative lead so that the potential difference between the coils and frame of the speaker is only 110v. The frame of the speaker should be earthed.

    CIRCUIT.

    The high-frequency valve is one of the new variable-mu pentodes and is high-frequency transformer coupled to the triode detector.
    There are two L.F. stages, both being resistance coupled, which is responsible for the excellent tonal quality of the receiver. The output valve is a superpower pentode.
    Full wave rectification is employed. The total power consumption of the set is 45 watts.

    However, despite this new look, the wave change was still by plug-in coils. The cabinet would need a side door to access this.

    The price of the kit was £13 including the speaker. It is not clear if this includes valves & cabinet. 

  • Price in first year of sale
  • 13.00 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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