Because drawing a digital "8" requires only 14 discrete lines (segments), whereas raster would require scanning the entire screen.
: Some designs use tubes like the EF80 as amplifiers for a vintage aesthetic.
CRTs require high voltage for the acceleration anode, often between 500V and 2000V DC. The schematic must include a flyback transformer or a Cockcroft-Walton voltage multiplier to step up low-voltage DC to high-voltage DC. Crt Clock Schematic
The brain of the clock generates the vector paths for the numbers.
subgraph Display_Drive["Display Drive"] X_Amp["X-Deflection Amp"] Y_Amp["Y-Deflection Amp"] Z_Ctrl["Z-Axis Intensity Control<br>(Blanking)"] end Because drawing a digital "8" requires only 14
The high voltage connects to a resistor string to safely drop voltages for the internal elements:
Building a CRT clock involves several core subsystems that must be integrated into your schematic: The schematic must include a flyback transformer or
Amplifies DAC voltages to the high levels needed to move the electron beam.