1971 Philco color Tube Hybrid

[Electronic M]

Originally Posted by Lain94

Will do. Any advice about the metal rivets? Is it avoidable to drill them off or is that they only way if I need to replace the HV cup?

The cup looks like you can easily get away cleaning it. Even if he worst cup I encountered in a 13" Zenith color that had arced through the cup I was able to clean it with goof off drill out the carbon in the hole the arcing made them fill the hole with sensor safe silicone and it's held up for years.

There's several ways to remove rivits such as drilling, grinding the heads off with a Dremel (good for cases where you want to temporarily remove a rivited item), cutting the shaft of the rivit if the item it's securing is gone and it's loose in it's hole.
I'd leave the socket attached for cleaning.

[Lain94]

Originally Posted by Electronic M

The cup looks like you can easily get away cleaning it. Even if he worst cup I encountered in a 13" Zenith color that had arced through the cup I was able to clean it with goof off drill out the carbon in the hole the arcing made them fill the hole with sensor safe silicone and it's held up for years.

There's several ways to remove rivits such as drilling, grinding the heads off with a Dremel (good for cases where you want to temporarily remove a rivited item), cutting the shaft of the rivit if the item it's securing is gone and it's loose in it's hole.
I'd leave the socket attached for cleaning.

On a side note, does anyone have the schematic for this tv? I have one schematic of it but it is from an old magazine and the resolution of the scan is not so good. I can barely read most if any of the schematic. I am going to do a recap of all the electrolytics while I am working on this tv after I fix the primary issue it has. I am sure the caps are leaky given the age of the tv.

[Lain94]

A bit of an update. I tried using iso to clean up the gunk on the HV cup for the tube and also used a generous amount of super corona dope. I am still having the arcing issue however. I am not sure if this is because of a grounding issue, the voltage being too high, a bad CRT, flyback, transformer, or if there is still some hole somewhere? I am honestly stumped right now.

[Electronic M]

Originally Posted by Lain94

A bit of an update. I tried using iso to clean up the gunk on the HV cup for the tube and also used a generous amount of super corona dope. I am still having the arcing issue however. I am not sure if this is because of a grounding issue, the voltage being too high, a bad CRT, flyback, transformer, or if there is still some hole somewhere? I am honestly stumped right now.

Well you can get an HV probe/meter and check the HV to rule that out. If the fly isn't getting hot and you have enough HV and deflection then its probably OK.

CRT grounding can be checked by eye and by resistance.

You can investigate the source of the sound further by getting a few feet of insulative plastic or rubber hose sticking one end in your ear and probing around for the loudest arcing sound with the other end like how a doctor would use a stethoscope.

Lastly don't put corona dope on something that you haven't gotten completely spotless. Dirt can be conductive, stains in the plastic can be carbon tracking, and carbon tracking must be completely removed before corona dope or silicone is laid down (even if it means taking a Dremel to the plastic and grinding it away) or else the arcing will just penetrate the thin layer of dope and resume it's normal carbon track.
When Isopropyl (rubbing) alcohol fails I next use GoofOff to clean off residual dirt....That stuff will slowly melt the outermost layer of plastic or rubber so if GoofOff don't get it clean it's Dremel time.

[Lain94]

While I was cleaning the tube sockets in the tv, I noticed a rattling sound from the horizontal output tube and noticed a loose piece of metal or filament was loose and rolling around. I attached a photo of it.

This is pretty frustrating because this horizontal output tube was purchased recently by me to replace the bad horizontal output tube the tv had with it.. The horizontal tube was not originally making a rattling sound nor had any loose bits in it when I had put it into the tv a month ago.

What could have happened? Could it have been vibrations or just bad luck? The tv was sitting on an old hardwood floor and vibrations travel easily through the floor when one walks around the house.

I am guessing this means the tube is bad or is unsafe to use now and I should get yet another replacement?

It looks like a little metal "tab" instead of a filament though.

https://imgur.com/a/ChYo70o