Part 3/7:
Transitioning from setup to testing, the inventor carefully introduces a Variac—a variable transformer—to control the voltage supplied to the CRT. They explain their process of powering on the device and monitoring for any signs of activity.
Despite turning the Variac up gradually, there is no immediate response. The inventor questions whether the TV (which appears to be part of the testing environment or perhaps the device under test) is powered on, indicating uncertainty about the current state of connected equipment.