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-   -   RCA 21AXP22 picture tube/rebuilt picture tube (http://www.videokarma.org/showthread.php?t=248196)

oldtvsandtoy 06-25-2010 03:19 PM

RCA 21AXP22 picture tube/rebuilt picture tube
 
What is the better tube a original RCA 21axp22-a or a rebuilt 21axp22-a picture tube by rca in the 50's? Which one is worth more? I have one of each and both test very good. Would a original 21axp22 make the set worth more, or dont it matter? Thanks

miniman82 06-25-2010 04:52 PM

Naturally, the OG tube will please the purists more.

oldtvsandtoy 06-25-2010 05:17 PM

Quote:

Originally Posted by miniman82 (Post 2976694)
Naturally, the OG tube will please the purists more.

Even if the rebuilt 21axp22-a was done by rca?

miniman82 06-25-2010 07:30 PM

Is a virgin still a virgin after being 'broken in'?
I'm not a purist, personally I hate that stuff, but you know how 'they' get. lol

JB5pro 06-25-2010 09:24 PM

Quote:

Originally Posted by oldtvsandtoy (Post 2976688)
What is the better tube a original RCA 21axp22-a or a rebuilt 21axp22-a picture tube by rca in the 50's? Which one is worth more? I have one of each and both test very good. Would a original 21axp22 make the set worth more, or dont it matter? Thanks

If you search this forum I believe much is written about these very special tubes. That would be the best way for you to figure out what to do with them or how much to sell them for. I haven't read all you wrote to be sure but your question brought me to think I should remind you... many people could use either of them if you are not going to put them in a set yourself... and PLEASE.... BE VERY CAREFUL with them they are fragile and dangerous.
Thanks for checking things out here.
John

yagosaga 06-26-2010 02:50 PM

Quote:

Originally Posted by JB5pro (Post 2976718)
PLEASE.... BE VERY CAREFUL with them they are fragile and dangerous.

What does it mean? Is a metan cone 21AXP22 more fragile and dangerous than an all-glass tube?

bgadow 06-27-2010 10:33 PM

If they are both 21AXP22A, I would say it makes very little difference. I would go with the unrebuilt crt myself. It would be a very, very particular person to really make an issue of that.

There were some earlier 21AXP22 (non-A) tubes that would be more desirable, I feel, but they seem to be rare.

I'm a little more nervous handling a metal-cone crt myself. From what little details I've seen, it seems that they can be pretty nasty when they implode.

zenithfan1 06-27-2010 11:03 PM

Quote:

Originally Posted by yagosaga (Post 2976769)
What does it mean? Is a metan cone 21AXP22 more fragile and dangerous than an all-glass tube?

Yes, they are more prone to leak or implode. The metal ultor flange is what you never want to bang into anything, ever. And like most tubes, should be stored on it's face.


oldtvsandtoy, the non- rebuilt one should go in your set and the extra one could have a happy home in my Wingate:D Poke poke.......:)

Eric H 06-28-2010 12:25 AM

If I needed one I wouldn't care which one I got as long as it worked! :yes:

NewVista 02-02-2011 09:29 PM

Quick confirmation needed here.

When I fixed the flyback on my CTC-5, 21AXP22A guns started to glow neon blue & red. I had assumed the tube would have been fine but now tested it and filaments light nice deep red (meaning air not a problem ? as I would expect warmer orange color with air present ?)

On B&K tester a "short" shows up (in fact a 68 k ohm leakage heater-to-blue cathode)
B&K book said in this case use an isolating filament transformer - which I did but same symptoms --- and, by the way, ZIP in the way of Emission.

So is it air ? Who rebuilds these now?

miniman82 02-02-2011 09:54 PM

On my tube there will be nothing on the meter, then as you advance the control it will peg at full. This is the typical 'gas regulator' action which indicates a gassy tube, sorry for your loss. Join the club.

jeyurkon 02-02-2011 10:02 PM

It sounds like air to me too. Besides the action miniman82 mentioned the air cools the filament so that it will be a deeper red rather than orange or yellow.

jr_tech 02-02-2011 10:02 PM

Quote:

Originally Posted by NewVista (Post 2993850)
filaments light nice deep red (meaning air not a problem ? as I would expect warmer orange color with air present ?)

Sounds to me as if the tube has become gassy.:sigh:
What happens is the gas conducts heat away from the filament, and causes it to run cooler, hence the darker/dimmer red color. Now this may seem bass ackwards, but the heater is more likely to burn out when it is running this way because the resistance of the cool heater is much lower than when it is at normal operating temperature, so that it will blow out like a fuse that has excessive current running through it.
sad,
jr

miniman82 02-02-2011 10:16 PM

Quote:

Originally Posted by NewVista (Post 2993850)
Who rebuilds these now?


No one, like I said join the litany that is sad AXP owners praying for a rebuilder. :sigh:

NewVista 02-02-2011 10:19 PM

Was it the filament or G2 that you turned up ?

Did you get the glowing light show around the guns as well ?

Rebuilding may not work if there is glass-to-metal leak ?

Might drop in an all glass roundie if mounting is not too much hassle


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