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Phosphor effeciencies are a little different, picture will be dimmer than with the correct tube, also the 21cy has 2 high voltage terminals, one fed by a resistor by another. You could probably duplicate that part using a ctc7 or ctc9 schematic. Also sets with the 21cy had a bunch of purity correction magnets hanging around the back of the tube that the newer set wouldnt have. Its possible you might have a little trouble sorting the purity out.
The 21cy has the same physical size and shape as the 21fj. There is no safety glass however. You would probably have to remove the frosted glass from the front of the 21fj and tape it to the 21cy (look in the archives here for "cataract surgery").
It kind of sounds like a mess, but would definitely be better than a 21ax, because (I think) the 21ax has a flatter screen and wont fit the mask properly.
John
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