Motorola 19K1 restoration

[Eric H]

Doh! I thought you were using the 19" tube for some reason.

I have another dumb suggestion, is the heater lit on the test tube?

I've chased my tail a few times looking for something else only to find i had a dirty CRT socket.

[leadlike]

Could the doorknob cap be leaking HV, shunting it to ground? I once had a tv with low HV, it turns out the chassis was leaking HV to a metal rail that was part of the table it was sitting on! I measured about 9kv on the lead, and the table rail read about 1 kv.

Another possibility to explore-is that the proper flyback in the set? With all the hacked repairs someone was doing on the hv section, they may have been trying to put in a different flyback (hence the single doorknob cap-like they were trying to emulate the circuit the replacement fly came from?)

[bandersen]

Originally Posted by Eric H

Doh! I thought you were using the 19" tube for some reason.

I have another dumb suggestion, is the heater lit on the test tube?

I've chased my tail a few times looking for something else only to find i had a dirty CRT socket.

Yeah, it is - I wish it was that simple

Originally Posted by leadlike

Could the doorknob cap be leaking HV, shunting it to ground? I once had a tv with low HV, it turns out the chassis was leaking HV to a metal rail that was part of the table it was sitting on! I measured about 9kv on the lead, and the table rail read about 1 kv.

Another possibility to explore-is that the proper flyback in the set? With all the hacked repairs someone was doing on the hv section, they may have been trying to put in a different flyback (hence the single doorknob cap-like they were trying to emulate the circuit the replacement fly came from?)

Good call. I hadn't checked that before. It's a Thordarson FLY-40 which is actually the correct replacement for the original Motorola #24C792691.

I'll fire up my EICO 944 flyback & yoke tester and check it out. Might as well check the yoke too while I'm at it.


Here's another look at the darkened area Eric noticed earlier. It looks like there may have been some arcing in the past.


I think I can pull some doorknob caps out of my Admiral 19A15S. Someone replaced the old 6KV paper caps with several of them I've been meaning to replace them with some nice ASC plastic HV caps. Might as well do it now.