1980 Sears (Sanyo) 25" Console TV CRT Problem

[Reece]

Thinking about why new CRTs snap crackle and pop: I wonder if it's because there are minute sharp points here and there inside where HV concentrates, and after a while these get burned off? I don't mean actual needles sticking out but just little bumps in the coating and/or on the tube elements. They act like tall trees for the HV lightning to strike. Got to be some reason why the tube finally settles down.

Originally Posted by Reece

Thinking about why new CRTs snap crackle and pop: I wonder if it's because there are minute sharp points here and there inside where HV concentrates, and after a while these get burned off? I don't mean actual needles sticking out but just little bumps in the coating and/or on the tube elements. They act like tall trees for the HV lightning to strike. Got to be some reason why the tube finally settles down.

I remember reading about that once before, and that makes perfect sense. The TV quit doing the loud snapping while interrupting the picture now, and no apparent damage was done when it did snap. Probably had a big enough imperfection in it to cause what I experienced.