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  #1  
Old 06-25-2010, 03:19 PM
oldtvsandtoy oldtvsandtoy is offline
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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
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Old 06-25-2010, 04:52 PM
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miniman82 miniman82 is offline
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Naturally, the OG tube will please the purists more.
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Old 06-25-2010, 05:17 PM
oldtvsandtoy oldtvsandtoy is offline
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Originally Posted by miniman82 View Post
Naturally, the OG tube will please the purists more.
Even if the rebuilt 21axp22-a was done by rca?
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Old 06-25-2010, 07:30 PM
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miniman82 miniman82 is offline
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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
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Old 06-25-2010, 09:24 PM
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Quote:
Originally Posted by oldtvsandtoy View Post
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
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Old 06-26-2010, 02:50 PM
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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?

Last edited by yagosaga; 06-27-2010 at 04:02 PM.
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Old 06-27-2010, 10:33 PM
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bgadow bgadow is offline
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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.
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Old 06-27-2010, 11:03 PM
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Quote:
Originally Posted by yagosaga View Post
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 Poke poke.......
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Last edited by zenithfan1; 06-27-2010 at 11:07 PM.
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Old 06-28-2010, 12:25 AM
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Eric H Eric H is offline
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If I needed one I wouldn't care which one I got as long as it worked!
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Old 02-02-2011, 09:29 PM
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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?
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Old 02-02-2011, 09:54 PM
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miniman82 miniman82 is offline
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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.
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Old 02-02-2011, 10:02 PM
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jeyurkon jeyurkon is offline
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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.
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Old 02-02-2011, 10:02 PM
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Originally Posted by NewVista View Post
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.
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
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Old 02-02-2011, 10:16 PM
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Who rebuilds these now?

No one, like I said join the litany that is sad AXP owners praying for a rebuilder.
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Old 02-02-2011, 10:19 PM
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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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