23anp4

[Adam]

The 23ATP4, 23BKP4, 23BLP4 should replace a 23ANP4 according to sams tube substitution handbook, 1962. That's the one with the saftey glass glued to the front of the crt.
I have a 61 Zenith console with the 23ANP4, its a great set. Those 60s Zeniths are some of the best televisions, I just got a 19" b/w metal table top model that had been sitting in a barn probably for decades, and it still works.