I made a simple scope with this metod : I got from the scrap an old b/w set/monitor and another small color set that didn't work well but there is HV ! I cut the wires to the horizontal yoke, on the b/w set I got a line across the screen, well ! I turned off it. Then I connected the two wires of the yoke to a simple bf amplificator ad injected an audio signal into the amplificator. Immediately I seen on the CRT a glowing line, well, it's the signal !!! Then I rotate G2s pot to get a more brighter line (the set was junk... and i don't mind how it can last !)... For the color set it was a bit difficult : it has a bridge between two connections of yoke's cable, to prevent functioning the tv without h.d.y,with a piece of cable i make a jumper and made the same modifications that i did to the b/w set... it's fantastic, it's not a real 'scope, it's limited to 63Hz, but it's funny to see for the first time a signal !!!!!!!!!!!!!
I.