A One Valve Battery Receiver
Robert A. Wilson F.R.S.A
This e-book shows how to build a one-valve radio receiver using only a few components. It is perfectly safe for all ages, as the power supply is obtained from small 9 Volt batteries connected to make up the required 54 Volts for the high tension supply.
Two versions of the circuit are described. The first one, uses a very old HL2 triode valve. As this type is becoming more rare, a simple modification is described to make use of the far more common EF91 pentode valve instead of the HL2. EF91 valves are still in good supply, and not very expensive.
Some practical skills are required, such as the capability of using a few hand tools, including the use of a soldering iron.
Sources for all the components and materials are given in the book. Winding details for the home-made coil are also supplied.
This e-book has been prepared with large text and images so that it is perfectly readable in e-readers that can handle PDF documents. That includes Kindles
And Nooks. It can also be displayed on a computer, and printed out if so desired. 58 pages, 6,426 words and 64 images.
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