Mighty Monarch of The Air

[old_coot88]

Originally Posted by vts1134

FAIL!
No more discharge from the fly to the filament winding but problem is not solved. Every time I get over 95v I get sparks on the inside of the old 1X2, and sparks plus a blue glow on the new 1X2.

This is with the doorknob removed, right? What's happening to R89, the 470K resistor? Is it getting hot, or remaining cold? If R89 remains cold, there may be a leakage path from the 1X2 socket itself to ground that's dragging down the HV. If R89 is getting hot, it may be that the 1X2 (in this case either one) is gassy and passing unrectified pulse that's hammering the resistor.

Time for a new $35 capacitor.

A new cap isn't going to help until you get the current problem sorted out. All this cap does is smooth the rectified pulse coming out of the 1X2.

One other thing- when you re-installed the flyback, where you soldered the filament loop back to the 1X2 socket, are there any whiskers or sharp points to the joints? In soldering any HV connections it's very important to build a nice 'ball' of solder on each joint to eliminate any points.