ctv picture tube or cathode ray tube

CRT TV  means cathode ray tube television

The picture tube
Cutaway rendering of a color CRT:
1. Three electron emitters (for red, green, and blue phosphor dots)
2. Electron beams
3. Focusing coils
4. Deflection coils
5. Anode (collector)
6. Mask for separating beams for red, green, and blue part of displayed image
7. Phosphor layer with red, green, and blue zones
8. Close-up of the phosphor-coated inner side of the screen

The cathode ray tube was running volt 25kv.
more infomation
at this web
https://en.wikipedia.org/wiki/Cathode_ray_tube