Special Features:

Major components: audio transformer 1; solid state circuitry; frequency output per channel: 1020.0 hertz to 1380.0 hertz ; frequency shift: 120.0 hertz; stepped frequency adjustment; average output power rating per channel: 3.6 watts; channel output: 600.000 ohms; external operating voltage: 12.0 vdc single; enclosure type: open; shape: rectangular; key set generator, telephone and telegraph

Properties:

Two or more different types of items, having a common mounting or mounted on each other, which together form a portion of an oscillator but which in itself is not a complete functioning item and cannot be assigned a more definite item name.