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IIRC you have a CRT tester, but not a 'tube' tester. Some signal tube testers could do CRTs, but CRT testers were generally not made so as to be capable test signal tubes. You will need to get, borrow, or bring your tubes to a proper tube tester. If you do not intend to work on pre-octal tube (they came out in '36 but the older types lingered in some new designs until WWII) based sets then one of the cheaper 60's-70's testers (like the B&K dynajet 606 I use) should be sufficient to your needs and fairly cheap to buy....Just make sure it has a quality meter (the uber-cheap filament continuity only testers which have no meter are useless as a tube test instrument IMHO).
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