Receiving sets in the Twenties part 2.

From Harmsworth's Wireless Encyclopedia.

Wireless reception de luxe. Hinged doors conceal the operating knobs and controls of this entirely enclosed Marconi four-valve set.	Three-valve Marconi set. Incorporated in the cabinet of this three-valve set is a concealed loud speaker.
Affording at the same time protection from dust and damp and providing a highly ornamental exterior, the cabinet-work of the Aristocrat set is most elegantly conceived.
Mounted as it is on hinges, the whole panel moves outward to allow of inspection of the interior of this receiving set at any moment.

The Polar seven-valve set embodies tuning scales which make the tuning in of any station a matter of ease and certainty for the amateur.

A four-valve enclosed receiving set for home construction. Tuning coils are used to increase the wave-length range as required.

Details of the amateur-made set. Transformers, valve platform, switches and other details of the set shown above are seen here. The construction of this efficient set may be carried out at home.

Rear view of the four-valve panel. A striking feature of this home-constructed instrument is the very neat way in which the components and wiring have been arranged.

Theoretical circuit of the four-valve set. The wiring of the set illustrated above is shown here.

Receiving sets in the Twenties part 1.

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