Penta-Quester AC AW439

Amateur Wireless and Electrics & Amateur Wireless and RadioVision Magazines; London

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  • Year
  • 1934
  • Category
  • Kit (Parts plus instruction) or building instructions only
  • Radiomuseum.org ID
  • 354761

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

 Technical Specifications

  • Number of Tubes
  • 4
  • Valves / Tubes
  • Main principle
  • TRF with regeneration
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Alternating Current supply (AC)
  • Loudspeaker
  • Presumably Dynamic Loudspeaker (moving coil)
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Penta-Quester AC AW439 - Amateur Wireless and Electrics
  • Shape
  • Tablemodel, high profile (upright - NOT Cathedral nor decorative).
  • Notes

  • The same circuit as the earlier battery-powered Penta-questa. One special difference is the use of an ordinary pentode output power valve in place of the class-B system. With this, of course, is an ordinary type of transformer coupling. At every vulnerable point in the design, full decoupling has been added, so that even under the most stringent conditions the new design is absolutely stable.

    For the high-tension supply from the mains a maximum output of 250 volts is available from the full-wave valve rectifier. The equipment for the mains high-tension is fitted on the shelf of the loudspeaker, supplying not only the high-tension but also the low-tension A.C. voltage and grid bias through the usual resistances. Control is just the same in the mains version as in the original battery model. There is one knob for tuning, another for input-volume control, and a differential reaction control.
    "Added Power from the Mains." All the excellent qualities of the battery Penta-quester have been carefully retained and, of course, there is no doubt that with the added power from the mains the quality and volume are even greater. Further, there is the very great convenience of mains working, with its entire abolition of battery charging and renewals. The total consumption of the A.C. Penta-quester taken from the mains is not more than 4o watts, which is appreciably less than the consumption of the average electric light bulb.

    From the illustration shown at the centre of this page, you can appreciate the fact that the AC Penta-Quester divides itself into two parts the main metallised wood chassis and the platform containing the power equipment behind the loudspeaker. This is a very convenient way for the home constructor to build a mains set and with this particular design there was the further advantage that the outline of the original layout could be retained. Naturally, connecting leads go from the power unit to the chassis, but these are very simple to follow and there is no possibility of any mistake.

  • Mentioned in
  • -- Original prospect or advert (Amateur Wireless Jun 16, 1934, Page 608)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

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