In a basic CW transmitter, what type of electricity directly powers each stage?

The active electronic components inside a transmitter, such as transistors, operational amplifiers, and integrated circuits, require a steady, unvarying voltage to function. Therefore, Direct Current (DC) is the type of electricity used to directly power each stage of the circuitry. Even if a radio is plugged into an Alternating Current (AC) wall socket, its internal power supply must rectify and filter that AC into smooth DC before distributing it to the individual stages. Radio Frequency (RF) and Audio Frequency (AF) currents are the signals being processed by the radio, not the power source driving the hardware.