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Each gun of any roundie P22 is the same as a gun of a standard 21 inch B&W of the same era. This includes the 15GP22. But you have to check and be careful that the tester generates the correct filament voltage with the tripled current. Even if the red gun tests 1/2 of the others it will produce an accurate if dim picture.
Do note that with these old color crts its best to run the heaters at least 30 minutes before starting testing the emissions, and watch each gun for 15 minutes under test
to see if it wakes up. If the red gun wakes up in 15 minutes its a winner.
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