This useful benchtop equipment contained a band spreading system. The two-tube circuit had frequencies determined by capacitors that could be switched. The circuit did not include the power supply. The circuit is from a Radio Craft from August 1947.

This useful benchtop equipment contained a band spreading system. The two-tube circuit had frequencies determined by capacitors that could be switched. The circuit did not include the power supply. The circuit is from a Radio Craft from August 1947.