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If it's in clean condition and complete that would be fair. One of the noted problems the 747's have is unstable readings which is a simple fix. There are lamps that are used inside for balance and the sockets can become resistive under test. Some folks say to solder the bulbs directly but I've found that the bayonet side of the lamp holder spins around quite freely so I soldered them to keep from moving...thus making a solid connection and it solves the problem.
On a lessor note, I'd take a couple known good/bad tubes with you and check it's operations.
I use mine as my first "go to" tester but for some reason I have problems checking 6GH8/6KT8/6EA8 type variants accurately in it's dedicated (#6) socket. And sometimes as with most checkers you may come across a less common tube type that just won't check, maybe based on the set ups, however rare.
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