Replacing the CRT

[DaveWM]

My 1st, its a CTC-21 I have a CRT to go in it, anything I need to watch out for?

a combo, I plan to put it down on blankets making sure the knobs are protected (will just remove).

support the combo with some wood blocks to take the weight on the corners.

I assume I should just unplug the CRT remove the blue lateral, the purity, and the convergence, then the yoke. with every thing off then the shield, and the degauss. I dont know how the CRT is fastened so I will need to address that once I get back into it.

[andy]

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[DaveWM]

I have a full poly carbonate face shield I plan to where.

The one that is coming out has a bonded safty glass lens, the replacement has a tension band on it.

[freakaftr8]

Doesn't the bonded CRT's have a tension band as well? I swear they do.. I replaced a 25GP22 outta my CTC-17 when I got it cause the neck was snapped off. I replaced with a Zenith 25XP22. It had a tension band and bonded safety glass.

[ctc17]

Easy Dave, dont stress it. The first few times I was a bit freaked but now I can swap one out in 45 minutes max. Purity and convergence are another story but I have got pretty good at those now too.

Be careful removing the items off the crt neck, the plastic parts can crack very easy. Take a picture of the items on the next but dont worry about getting them in the exact same area on the new crt. The order is important but not the location. Most likely everything will be adjusted totally different once you finish convergence setup.

I just pull the whole chassis and tuner out on those so there shouldn't be any knobs unless the tuner is in the front.

once you get the crt fastened back in stand the unit up and inspect that the crt centered in the mask. It could be off to one side and need to be moved.

[Dan Starnes]

It seems to take me longer to get it set into the mask area longer than anything. Like stated above, be careful and leave yourself plenty of room to move around and a designated area to put the CRT once you have it removed.

[Dennman6]

I have a 1963 RCA Victor B&W console that uses a 23ENP4 CRT, with the tension band around it. As an ignorant 15-year old I swapped this out for a CRT in another RCA set about 1977, then after a few months swapped them back. Any reason I should be wary about removing it at this late date? I want to try & get it to Hawkeye before they close in 2 months. This was my parents' first new TV, before that they had a second-hand 1950s Zenith 21 inch console. The set hasn't been turned on since 2006.

[Username1]

I'de go safety googles over a face shield.......... then bury the old tube in the yard......
Maybe goggles and not googles.... dam that google.....

[DaveWM]

well the plan is to do it Saturday morn so I will report back on how it goes.

I am a little intimidated, and its not my set so I hope it goes well.

[ctc17]

Originally Posted by Dennman6

I have a 1963 RCA Victor B&W console that uses a 23ENP4 CRT, with the tension band around it. As an ignorant 15-year old I swapped this out for a CRT in another RCA set about 1977, then after a few months swapped them back. Any reason I should be wary about removing it at this late date? I want to try & get it to Hawkeye before they close in 2 months. This was my parents' first new TV, before that they had a second-hand 1950s Zenith 21 inch console. The set hasn't been turned on since 2006.

I very strongly suggest you pack the thing to be dropped from 5 feet minimum and insure it for a lot. Also take pictures of your packing job and box before it leaves.
I have had 3 tubes rebuilt by hawkeye recently and I can say he does amazing work. On the other had UPS does an amazing job at destroying crts or just about anything. Out of 3 crts, one was totally demolished and replaced by insurance, one had the safety glass broken on the way to him and on the way back to me and one made it just fine.

Dont be intimidated Dave, the intimidation and fear will cause you to make mistakes. Nothing to it. Once you get the chassis out its easy. Take lots of picture, that always makes it easier.

[andy]

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[holmesuser01]

I have replaced many color CRT's in my years. Some have given me issues with convergence, and purity, but I think the hardest part was getting the tube centered in the mask. Dont tighten the bolts down more than just snug. Not all CRT's are exactly the same size.

[sampson159]

yes,they are all not exactly the same size.some crt s are off by as much as a 1/4 inch.you have to snug the bolts and flip the set up and wiggle it around to seat.no big deal unless you like that nasty little gap in the mask.

[wa2ise]

Originally Posted by ctc17

I very strongly suggest you pack the thing to be dropped from 5 feet minimum

Pack it so you can roll it down a flight of stairs. Really.

[ChrisW6ATV]

Originally Posted by wa2ise

Pack it so you can roll it down a flight of stairs. Really.

This sort of packaging necessity is sad, but true. And, now UPS adds insult to injury on top of it all by charging extra "dimensional" fees when you do pack something safely enough to be handled by their goons.