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I've tested the 7 inch CRT tubes on my Beltron and most test good. The biggest problem I have seen is a tube that tests good may still be dim. I would guess phosphor degradation from ion burn. My 8 inch has a spectacular picture with no burns but I rarely use it. I run the chassis with a seven inch.
No need to remove the metal from the neck of the tube. To test them I just put the tube in a working chassis. I use a TS-4 for a everyday driver and it has its original CRT and after a couple of minutes it is bright and clear.
Love that Philco!!
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