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The Sams for my Philco F4626M lists 21ACP4A and 21AMP4A (but not 21CUP4), so I'll add 21CUP4 to my want list.
The 17AP4 in my DuMont RA-113 was replaced with a 17BP4A. The overall length is too great and the bell profile is just different enough that it's a struggle to get the yoke far enough forward to fill the screen.
It's good to know what to look for, anyhow. Thanks!
Phil Nelson
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