|
We used to make them in the shop. Let's see..... . Diameter was about 12"
Wire was like 30 AWG magnet wire (insulation is a varnish and much thinner than plastic insulation, but plastic could work too....just bigger wad) Wound about 100 turns of copper wire around the 12" diam. That's about 314 ft of 30 AWG wire at 104 ohms/1000 ft = ~ 30 ohms. At 115vac, 30 ohms yields about 3 amperes. That'll work. Attach a 10 ft (roughly) lamp cord capable of carrying 3 amps @ 115v and wrap the whole thing up in elect tape. Be sure all loop wire and any elect connections are covered. You're dealing with lethal voltage if you contact it so make sure it's covered. Now you have a round hootus, 12" in diam, about 1" thick with a cord hanging off it. Plug the cord in and approach your tv. Your tv will have lots of mixed color circles on it when you get close. Hold about 1-2" from glass (parallel to the glass) and move about (around) all over the front, out to the sides and all, in a nice slow circular fashion, for about a minute. Coil should buzz (noise), but shouldn't be getting hot. Then to finish up, start making full screen width circles and as you start moving the coil away from the face of the TV, make the circles smaller and smaller till you have moved back a couple of feet. You should now have a "pure" raster. Unplug the coil.
----- ----- ---
The vac, or any magnetic field adjacent to the shadow mask of the pic tube will do it. Mark
| 
