BEGINNERS who want to try their hand at building a simple, inexpensive radio will find this compact, one-tube A.C.-D.C. set to be just the type of receiver for their needs. It is easy to build, and with a good outdoor antenna it will pull in stations from South America and Europe almost any evening. Tracing the circuit from the antenna, the signals enter the set through a .01-mfd. paper condenser to the primary winding of a 6-prong plug-in tuning coil. The secondary winding of this coil is tuned by means of a midget, .00014-mfd. variable condenser. A set of plug-In coils gives complete coverage for all wave bands.

The signals then enter the grid of the detector portion of the dual tube (12B8GT) by means of a .00025-mfd. mica condenser and a 3-meg., watt resistor.

Signals from the plate of the detector then go to the headphones through the tickler winding and a 2.5-mh. plate choke. A 20,000-ohm potentiometer across the tickler winding controls the amount of feed-back between the tickler and secondary windings.

The second portion of the tube consists of a triode, which rectifies the alternating house current so that only direct current reaches the plate of the detector. Hum is filtered by a 20-h. choke and two 16-mfd., 150-volt electrolytic condensers.

This radio has only two controls. The cabinet scales 41/4 by 5 by 51/4 in..