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 Post subject: Putting the yoke back on the picture tube
PostPosted: Sep Wed 30, 2020 3:00 pm 
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Joined: Nov Fri 15, 2013 10:17 pm
Posts: 2211
Location: Haddon Heights NJ
I'm restoring an old 1956 Admiral tv, i got a replacement crt. I rebuild the yoke cover where the alignment rings sit. I started to put the yoke back on the new crt but it seems very tight. The inside of the yoke is lined with a carboard form. When i took the yoke from the old tube (sometime ago) don't remember being that tight. Is possible that the neck of this crt may be a little bigger that the original (it is the same tube (21ATP4). I don't know how much force i can put on the yoke so is not to damage it, this is the first time that i have changed a crt.
I'm thinking on smearing the inside of the yoke with petroleum jelly, or using WD40.
Any ideas?

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 Post subject: Re: Putting the yoke back on the picture tube
PostPosted: Sep Wed 30, 2020 10:52 pm 
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Joined: May Thu 14, 2015 4:15 pm
Posts: 2642
Location: Dallas, TX
Don't use any lube.
I think you should be more concerned with the CRT neck that the yoke.
Can you remove the cardboard liner? Sometimes a piece of cardboard is slipped in around the CRT neck after the yoke slides past the CRT base. The base is often the widest part.

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 Post subject: Re: Putting the yoke back on the picture tube
PostPosted: Oct Thu 01, 2020 12:50 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1077
Location: Southwestern,Ontario Canada
You can try a small size pipe expander. They come in 3 sizes to expand exhaust pipes on cars. They aren't too costly. I've had this problem with a few yokes being to tight on the neck of the tube. They don't need a lot of turns to give it a little extra room due to shrinkage of the yoke over the years (mostly the plastic wrap they used to keep the winding's separated.)

https://www.amazon.ca/Small-Tail-Expand ... B01HLUVHQM

https://www.ebay.com/itm/Small-Tail-pip ... 1794843916

Tony


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 Post subject: Re: Putting the yoke back on the picture tube
PostPosted: Oct Thu 01, 2020 1:06 am 
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Joined: Nov Fri 15, 2013 10:17 pm
Posts: 2211
Location: Haddon Heights NJ
Thanks guys, i just push it a little bit harder and passed the bit thicker part of the neck.

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