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When I got my 21CT55 the and the seller who was transporting it to the ETF in Ohio from Texas asked me how I thought it should be packed I asked them to pull the chassis, knobs and pencil box out of the cabinet and transport the cabinet face down on blankets...on the trip home I did the same and had styrofoam sheet insulation between the blanket and floor of my truck. The 21AXP is still putting out a good picture today.
I've had a number of NOS CRTs, better than half were color, in original packaging in my hands and all of them were specifically designed to transport the tube face down on styrofoam padding so to me that is the most correct way to store and transport them.
I have also safely transported 2 more AXPs in cabinet upright and one on its side (I thought that tube was dead, but after I got home I found it just had bad heater pin solder and was easy to fix).
I've also transported 3 loose ones face down without incident.
All the gassy ones I've had/seen (and I have seen a few) were DOA from previous owners. And most were kept in humid non-climate-controlled spaces for years.
I worry about the face seal, but I worry as much about the brass evacuation nipple on the neck of most 21AXP22s.... Every gassy AXP I've seen had the brass nipple....The only all glass envelope 21FBP22 I've seen gassy (there have been 2 so far ) also had the brass nipple...I believe those brass nipples are less reliable than glass evacuation stems.
If you are gentle with it it should arrive as good as it left.
If the set has raster your fine, but if not beware....A gassy tube can test strong on a CRT tester (but have weird cutoff behavior and sometimes visible purple neck glow of death) and yet be unusable in a working set.
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