Just out of curiosity, regarding all this thread, didn't Apple have more than one manufacturer for the CRTs? I'm thinking something like that wouldn't be any different of a situation as the iMac G3 did. On some iMac G3s, Apple had LG and I think Samsung making the tubes, but both had to match with the PAV Board inside those machines.
Again, just curious as to whether it applies. I'd hate to see someone putting in a generic tube that was claimed matching to a specific model of compact Mac and suddenly things start going wrong after installation.

73s de Phreakout. :rambo:

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Scott's already answered, but I'll just add some repetition: All CRTs are fully interchangeable electrically among the compact Macs. There are electrical differences among the deflection yokes, however. So, to be safe, swap only the CRTs, and leave the yokes with the analog board.

Back in the day when Gamba was with us (RIP, Gamba), he noted that the pins on some CRTs were rotated 180 or so degrees. In some cases, the connector rotation occasioned by this arrangement ate up enough slack to force the lengthening of one or more wires.

Finally, as Scott has noted, different manufacturers used slightly different phosphor recipes, so there is a difference in the color of the raster among the different types.