CRT

Welcome to AAC!

CRT is a component. Specifically it is the display used in old TVs and Oscopes.

An Oscope, like TVs, can use a CRT or other. Generally CRTs are cheaper, and require much fewer parts to get working.

I moved your post to an area where it might get a bit more help.

 

Beginners to electronics might not know what is a CRT used in older electronic equipment.
We are well acquainted with the Liquid Crystal Displays (LCD) used on mobile phones and computer screens. The LCD is a relatively modern invention.

Remember those big clumsy computer monitors? Those are based on CRT technology that generates a stream of electrons that hit a phosphor on the glass screen of the CRT to produce visible light.