Which indicator power supply furnishes the cathode ray tube (CRT) operating voltages?

The high voltage power supply is responsible for providing the necessary operating voltages for a cathode ray tube (CRT). CRTs require specific high voltage levels to function correctly, including the anode voltage, which is critical for accelerating the electrons emitted from the cathode.

These high voltage levels are essential for creating the bright images displayed on the screen. The high voltage supply ensures that there is enough potential difference to move the electrons quickly across the tube, allowing them to strike the phosphorescent screen and produce visible images.

On the other hand, while the deflection circuit and panel control are important for other aspects of CRT operation, such as directing the electron beam and adjusting the display settings, they do not provide the high voltages necessary for the fundamental operation of the CRT. Low voltage supplies typically manage lower power requirements and control signals, but again, they do not address the high voltage needs crucial for the CRT's performance. Thus, the high voltage power supply is the correct answer, as it directly relates to the CRT's operational requirements.