1950s or '60s vintage Zenith TVs, Need some info

[old_coot88]

Looks like the cap just randomly decided to short. No doubt the resistor supplying B+ cooked also.

[vortalexfan]

Originally Posted by old_coot88

Looks like the cap just randomly decided to short. No doubt the resistor supplying B+ cooked also.

OK, well it was a modern replacement cap (the yellow film variety) and it was one i had salvaged out of a radio I had recapped a couple of years ago that I ended up having to scrap out because I wasn't able find some parts to fix the rest of the radio.

That B+ Supply Resistor was an 8.2kOhm 3W resistor so not a very common value...

[vortalexfan]

OK so here's a picture of the burned up capacitor, has anyone seen a capacitor fail like this before, especially one that's only a couple years old?

[Electronic M]

Originally Posted by vortalexfan

OK so here's a picture of the burned up capacitor, has anyone seen a capacitor fail like this before, especially one that's only a couple years old?

You probably ruined it when you salvaged it...the plastic sides and dielectric/foil roll melt easily. If you accidentally touched your iron to the side of the cap and melted it a bit you could have shorted together the 2 capacitor metalized plastic plates, or damaged the dielectric enough to make failure easier.

I've ruined a few yellow caps with my iron myself....I don't like that they can melt easily so I only use them if I'm restuff paper caps or dealing with a situation where I need extra long leads and I don't want to Western Union splice longer leads on.

[vortalexfan]

Originally Posted by Electronic M

You probably ruined it when you salvaged it...the plastic sides and dielectric/foil roll melt easily. If you accidentally touched your iron to the side of the cap and melted it a bit you could have shorted together the 2 capacitor metalized plastic plates, or damaged the dielectric enough to make failure easier.

I've ruined a few yellow caps with my iron myself....I don't like that they can melt easily so I only use them if I'm restuff paper caps or dealing with a situation where I need extra long leads and I don't want to Western Union splice longer leads on.

Well I had replaced the burned up one with another one and for some reason the picture tube is glowing a purplish color inside the neck near the socket, and I'm not getting any picture on the screen.

[Yamamaya42]

Originally Posted by vortalexfan

Well I had replaced the burned up one with another one and for some reason the picture tube is glowing a purplish color inside the neck near the socket, and I'm not getting any picture on the screen.

NOT GOOD

that means the CRT is gassy. like seen here
https://www.flickr.com/photos/70039806@N00/5379156237/

Running it with a bad tube like that can cause all sorts of nasty feedback problems.

[vortalexfan]

Originally Posted by Yamamaya42

NOT GOOD

that means the CRT is gassy. like seen here
https://www.flickr.com/photos/70039806@N00/5379156237/

Running it with a bad tube like that can cause all sorts of nasty feedback problems.

What would of caused it to do that? Because it wasn't doing that before, the picture tube was running normally (no purplish glow) up until that capacitor failed.