View Full Version : Substitution Options for a 21CXP4


JSM092495
12-07-2016, 10:19 PM
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, 11:11 PM
21CXP crosses to 21DSP according to my 1977 sams tube sub book.

dieseljeep
12-08-2016, 11:39 AM
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, 12:02 PM
This might help...