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As I recall reading somewhere....those 'test tubes" were "rejects" from the assembly line" that did NOT pass RCA standards, and often had some kind of "mechanical problem",(most likely this would mean a shadow mask defect or such) and RCA did not feel they could be used for normal CRT"s--so they often "gave them away" if someone bought a new tube or test jig or such. They were claimed to be "electrically perfect" though...and good enough for a "jig".
But..that was THEN...when a nice roundie color crt was readily available. and THIS is NOW...
And MANY of us would NOT be unwilling to use a "somewhat imperfect tube" if that is all we could find., for a 21CYP22, or 21AXP22 or such. Maybe even in a "lesser set" even for a 21FBP22--too. IN ANY case--that tube is NOT "junk" anymore!!
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