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  #1  
Old 03-01-2010, 06:48 PM
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WTB: 23MP4 Kine

New would be nice. Used and good is always nice, too.

I need it for an old Magnavox that I will be restoring.

Thanks

Bruce McGee
Asheville, NC
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Old 03-01-2010, 11:49 PM
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You could also use a 23FP4A or a 23WP4 CRT. Both are direct replacements.

Cheers,
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Old 03-02-2010, 08:03 AM
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VDC lists a 23MP4, but when I tried ordering one over a year ago they said it was an inventory error and sent a substitute. Well, the sub works fine, what they didn't do was refund the $60+ difference in price between the two. Two letters to them about this went unanswered.

So if you're inclined to order a CRT from VDC, PM me and I'll look up what they sent me (can't remember offhand.)
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Old 03-02-2010, 06:23 PM
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Quote:
Originally Posted by Findm-Keepm View Post
You could also use a 23FP4A or a 23WP4 CRT. Both are direct replacements.

Cheers,
Thanks for that heads-up!

Bruce
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Old 03-03-2010, 11:01 PM
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It might help to grab a tube manual as well. For years, I was hunting for a 21amp4a, but never found one, or any of its direct replacements. So I pulled out my GE tube manual, and let it broaden my search. I found many more tubes that would work if I only made minor changes to the set. Finally I found a new 21cbp4, which was a newer tube that did not use the magnetic focussing hardware that the 21amp4a needs. While it may not be stock, the set displays a beautiful picture now. I would think that any 114 degree picture tube could potentially be made to work for your set.
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Old 03-04-2010, 06:11 PM
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Quote:
Originally Posted by leadlike View Post
It might help to grab a tube manual as well. For years, I was hunting for a 21amp4a, but never found one, or any of its direct replacements. So I pulled out my GE tube manual, and let it broaden my search. I found many more tubes that would work if I only made minor changes to the set. Finally I found a new 21cbp4, which was a newer tube that did not use the magnetic focussing hardware that the 21amp4a needs. While it may not be stock, the set displays a beautiful picture now. I would think that any 114 degree picture tube could potentially be made to work for your set.
Somewhere in the wreckage that I call my home, I have a RCA receiving tube manual from 1973... the one with the red, black, and white cover, that covers tubes and kines. I havent needed it in many years, until NOW!!

I plan to hunt for it this weekend.
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Old 03-04-2010, 10:03 PM
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I have an RCA manual a little older than yours (60s) and while it did have a kine section, it wasn't as detailed as my GE tube manual was. Reprints of this manual are available at AES. The title is "Essential Characteristics" and it is the best tube manual I have ever owned.
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Old 03-07-2010, 08:45 AM
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The tube I have has an intermittent filament now. I fed it 7 volts, and it died on my tester. RIP. How hard can it be to find a 49 year old kine?
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Old 03-07-2010, 02:50 PM
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I'll have that sub tube number tomorrow - I have to pull the back off my set.
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Old 03-07-2010, 03:53 PM
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Quote:
Originally Posted by holmesuser01 View Post
Somewhere in the wreckage that I call my home, I have a RCA receiving tube manual from 1973... the one with the red, black, and white cover, that covers tubes and kines. I havent needed it in many years, until NOW!!

I plan to hunt for it this weekend.
My earlier post with the two suggested replacements comes from my RCA CRT Characteristics and Replacement Guide dated 11-75. Maybe your manual from 73 has more.....

Cheers,
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  #11  
Old 03-07-2010, 05:19 PM
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Quote:
Originally Posted by Findm-Keepm View Post
My earlier post with the two suggested replacements comes from my RCA CRT Characteristics and Replacement Guide dated 11-75. Maybe your manual from 73 has more.....

Cheers,
With these 3 numbers, Im hoping to find something that works.

Thanks for all of your help.

Bruce
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  #12  
Old 03-08-2010, 12:57 PM
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I heard from VDC this morning in Tucker, GA. Using all three tube types I've got, they have no replacement tube of any kind. I offered to send down my dud tube, but they have no gun assemblies anymore. The search is underway!
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  #13  
Old 03-08-2010, 05:31 PM
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Also 23ALP4 and 23AMP4.
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  #14  
Old 03-08-2010, 05:36 PM
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Quote:
Originally Posted by John Marinello View Post
Also 23ALP4 and 23AMP4.
Thanks, John, adding these numbers to the list.

Bruce McGee
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  #15  
Old 03-08-2010, 05:43 PM
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John Marinello John Marinello is offline
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I know where there's a 23EP4, if you get real desperate. It has a slightly
lower difflection angle, so it's a longer tube. The 23EP4 also has a safety glass, not sure what else is different,
but you can compare here:

23EP4 http://tubedata.tigahost.com/tubedat...68/2/23EP4.pdf

23MP4 http://tubedata.tigahost.com/tubedat...68/2/23MP4.pdf

Last edited by John Marinello; 03-08-2010 at 05:48 PM.
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