Do you still have an old analog CRT television lying around ... s steps to build a simple oscilloscope, don´t throw away that vintage TV!, it is a great source of analog parts.

Flatscreen CRTs can have a distorted image, poor beam geometry, and are heavier and bulkier. Large CRT TVs are extremely heavy. Avoid screens with composite inputs, opt for S-Video (or better) for ...

Whether your screen is a domestic TV or a dedicated monitor, the heat and voltage stress of driving a CRT made these devices significantly less reliable than many of their modern-day counterparts.