Last week on my way to work I discovered dozens of obsolete CRT televisions placed out for the hard rubbish collection – this week I walk past and a half dozen of said televisions have had their screens shattered and the back panels ripped open.
So why have the backs of these televisions been broken open? It appears someone wants the deflection yokes, not to be confused with someone stealing egg yolks.
Boom boom tish!
This is what the back of a cathode ray tube normally looks like (photo from Wikipedia).
By themselves the deflection yokes are rather boring: they are just a coil of wire that produces a magnetic field, and a functional equivalent can be made in the workshop in an hour or two.
However, there is a far more interesting component at this end of a CTR: the electron gun. A colour television has three of these guns – red, green and blue – and each of them produces a beam of electrons which is used to draw the actual image on the screen.
So what could someone do with a few dozen scrounged electron guns? I would like to find out.