|
I had a few minutes to work with this tonight. The chassis is on the bench, no connections to the crt or yoke, horiz. output tube removed.
I quickly switched the set on & off a few times with no adverse reaction. About the 4th time I got an arc, & repeated it. It was between 2 legs of the burst phase coil, the ground leg & the leg hooked to the plate of the 6GH8 burst amp. (355v per Sams) What was in between the two traces was, of course, carbon. I had noticed it was suspect here but thought I had cleaned the traces enough. This time I cleaned it with gojo & a toothbrush, then wiped down, then cleaned good with alcohol. Everything looks like new around there now. But I'm not ready to try it again. I know this was not the only place arcing, unless I was seeing things. There is a chicken & egg thing going on here-I assume it arced, taking out the coil at some point, leaving carbon, continuing the arcing, but I could swear other areas are arcing instead, on occasion. I have to figure out why. The plate lead also connects to a .82pf cap into the color oscillator and ACC circuits. This is where my lack of any 'real' training in electronics shows, as I can get to this point but have trouble grasping where the problem lies because I don't fully understand theory. This is how I learn, though. And I've learned more off these forums than anywhere else. Thanks for the advice so far, which I will continue to follow up on, & thanks for any advice to come!
__________________
Bryan
|