All-Wave All-World Skyscraper

Lissen Ltd.; London and Richmond, Surrey

Data
Forum
Pictures
Collections

  • Year
  • 1933–1935 ?
  • Category
  • Kit (Parts plus instruction) or building instructions only
  • Radiomuseum.org ID
  • 223535

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, Long Wave and 2 x Short Wave.
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - This model requires external speaker(s).
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: All-Wave All-World Skyscraper - Lissen Ltd.; London and
  • Shape
  • Tablemodel, high profile (upright - NOT Cathedral nor decorative).
  • Notes

  • The Lissen Skyscraper 4, is a battery-operated set covering four wave-ranges nominally:

    • 12-35 metres
    • 28-80 metres
    • 195-520 metres
    • 800-1,970 metres.


    It is cleverly planned so that it may be built by the least experienced home constructors with the virtual assurance of success.
    Basically, the circuit comprises a three-stage HF, Detector, and LF, with a single-tuned input and inter valve circuits, followed by a push-pull output stage.
    The various wave -ranges are covered by multiple coil assemblies with built-in wave range switches.

    There are several other interesting features, not the least of which is the combined volume reaction control, which is effected by a single specially designed component.
    This consists of a potentiometer through which the grid bias of the HF valve is varied from maximum negative to zero; further rotation of the control has the effect of increasing reaction feedback between plate and grid circuits of the detector valve in the usual way, grid voltage being meanwhile held at zero.

    With regard to the push-pull output circuit, which is coupled to the detector valve by a high ratio LF transformer, it should be noted that matching of the output valves is effected by adjustment of auxiliary grid voltage. To this end, individual pentode valves are supplied with the kit of parts that bear a label showing the appropriate voltage to be used, so the constructor meets with no difficulty and does not require any measuring instruments.

    In 1935 basic kit  £5 12s 6d (inc. valves)

    Extras: Table Cabinet 16s 6d, Consolette £1 5s

    About £8 for kit + Consolette case in 1933.

     

  • Price in first year of sale
  • 8.00 GBP
  • Author
  • Model page created by Michael Watterson. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum