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-   -   Substitution Options for a 21CXP4 (http://www.videokarma.org/showthread.php?t=268174)

JSM092495 12-07-2016 09:19 PM
Substitution Options for a 21CXP4
 
I'm aquiring a high end 1958 Zenith, I have no clue on the condition of the tube, until I pick up the set at the end of this month, but I suspect it's weak. I need some help on some substitutions since the original tube is not common.

I have a NOS 21AMP4 or a 21ALP4, if any of those would work that'd be great. Thanks.

Electronic M 12-07-2016 10:11 PM
21CXP crosses to 21DSP according to my 1977 sams tube sub book.

dieseljeep 12-08-2016 10:39 AM
Quote:
Originally Posted by JSM092495 (Post 3174473)
I'm aquiring a high end 1958 Zenith, I have no clue on the condition of the tube, until I pick up the set at the end of this month, but I suspect it's weak. I need some help on some substitutions since the original tube is not common.

I have a NOS 21AMP4 or a 21ALP4, if any of those would work that'd be great. Thanks.
The 21CX is a low G2 voltage CRT. It also is a straight gun tube so the neck is shorter. :scratch2:

Findm-Keepm 12-08-2016 11:02 AM
This might help...


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