Radio Control Box BC-496-A for SCR-274-N

Many bomber, fighter, and transport aircraft of the US Army Air Force and US Navy during WWII utilized the Radio Set SCR-274-N, a multi-channel aircraft radio receiving and transmitting system. Installations of the SCR-274-N Airborne Communication System would have Radio Control Boxes with control sections for 1, 2, or 3 radio receivers. Each section was used to control and tune one receiver.  The BC-496-A provided for 2 receivers, for the left control section for frequencies from 3-6 megacycles and the right control section for frequencies from 6-9.1 megacycles. A BC-496 may have been used along with a single section BC-473 in an aircraft whenever it was desired to split the controls between two operators. On each section, the top left switch marked A-B allows the operator to direct the audio signal output to one of two headset lines (A TEL or B TEL jacks at bottom), or off at midpoint between A and B setting.  The switch at the upper right of each section selected CW (Continuous Wave