[Tony V]

Check your focus lead where it goes into the crt socket. These are known to arc, crumble or corrode right at the pin in the socket. I had the same problem with mine and the problem was where the focus wire was connected to the focus pin in the socket was badly corroded. I fixed mine by taking the cover off the back of the socket. I then removed the focus pin and wire. After that I removed the wire from the pin, I cut about an inch off the wire because the corrosion had wicked back into the wire some. Then I cleaned the corrosion off the pin and soldered the wire and pin back together and reinstalled it. I also cleaned the focus pin on the crt and the crt socket while i was at it and checked for carbon trace. It took care of the problem and has been working great for almost two years now.

To get the cover off the back of the crt socket, get a 1/8 drill bit and just drill enough to remove the revit head. There are three of them. Pop the cover off and repair. After the cover is removed, you can remove the rest of the revit by pushing it through to the other side. To re-attach the cover, just find some small screws like you would find in a transistor radio or vcr and screw the cover back on using the original revit holes. Take your time putting the screws in to avoid cracking the bakelite socket. Some of these small screws have cutters made into the tips that will self tap the threads when installing. The good part about doing this is you can install the socket on the crt first and check for any arc's before re-installing the cover and coat with silicone or similar first. Remember that the wire leads just sit in the socket and use the cover to hold them in, so pay attention that the leads stay in the socket while your handling it with the cover off.
-Tony