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Switcheroo
Hi Terry,
My CTC-5 has a 21Cyp22 glass tube in it. I didn't install it but it looks to have all the 21AX mounting hardware. I imagine the 21FB should drop right in. The 21AX does have a metal flange that rests on the backside of the mask. You should probably pull the 21AX and measure the diameter, (the bulb face not the flange) vs. the 21FB. The only hangup might be mounting without the flange to secure it. Of course you must rest the cabinet on its face to remove and install the pix. tube. And follow safety precautions. Some one else can address any electronics differences such as high voltage connection and voltage differences.
Could be a fun project.
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