21AXP22 Date Code

[earlyfilm]

Originally Posted by Tim

Here is part of what Lud Sibley wrote about RCA CRT date codes.

Does this also apply to B&W CRT's?

Where can I find the rest of his codes?

I had been wondering if any of my 5TP4's were replacements. All were from TVs manufactured in 1949 (although one carried a 1948 model number.)

No letters found, except on the neck glass. (NEB, JEC, MEB & unmarked)

However, the back of the light-brown bases carried open date codes:
9-39
9-48
0-35
0-43

Ouch! So at least two were replaced the first year!

Sorry for posting a B&W question in the color forum, but I guess there is precedence. When the 15GP22 and 15HP22 first came out and no service shop had a color CRT tester, the instructions to test either was to use the 5TP4 setting and wire up jumper clips directly on the CRT socket for each gun.

James