[bgadow]

Most of my hobby time has been used up over the last couple months with a home-improvement project. Now, back to the Philco!

1) The LIN coil: I studied it more carefully, peeling back the tape the factory wrapped around it. Ugh, it looked like crispy critters. Not open, but as bad as it looked it sure seemed to be shorting. I couldn't help myself...I decided to try rewinding it. My first attempt wasn't pretty but at least didn't make anything worse as I had the same HV...and the same overheating coil. After a few weeks I took the time to take it apart and do a better job, getting more much more precise with wire length and neatness. (No, not going to win any awards.) Result: no difference in set performance but the coil no longer heats up.

2) I replaced the filament windings for V23 & V25, nice and neat. No change. V24 was another thing, and at first I didn't think it was even possible (the leads disappeared deep into the center of the flyback). Well, last night after careful examination I determined that the winding was actually around the outside of the main donut, but plastered with tape and epoxy. I really wanted to leave it alone but found the the short bit of leads that were between the flyback and the socket were very brittle and cracked when I bent the wires. Okay: put my Dremel to work and VERY carefully cut away enough to pull the old wires out and run a new winding. I then coated the outer donut with some HV putty and hooked up the the leads. (My plan is to shellac the flyback later on). Powered it up tonight and...drats! No change!

3) Clue? I can see the filament lit in V23 & V25 but what partly pointed me to having to break down and change the other winding was seeing that there was no light in V24. Don't worry, I've tried swapping it several times & tested the tube filament, besides. I also clipped-in a 2.5v bulb and it lit just fine. I'm not smart enough to understand why else the filament wouldn't glow. (yes, I know it would be very faint). I've swapped the resistor in the filament.

A few other things: I've tried swapping the doorknob at V24. I even tried swapping in an old stick rectifier. Nothing I do can get the HV above 12kv. Note that my testing is with the yoke connected but not the crt. I also notice that the flyback core is getting too high. Something is putting too much load on it...what? I'll keep plugging away. If anybody sees something I should try, let me know.