I've used a Sencore CR-70 with the little clip lead adapter to test a 15GP22; each gun is tested individually. The 15GP22 is even listed right in the book. Is the individual with the 15G even remotely familiar with vintage sets? If so, using the Sencore makes testing a 15G no harder than testing a 10BP4...
A quick word of caution though: a tube may appear to be very strong on a tester but be gassy enough to be unusable. The only true test for a 15GP22 is a working chassis.
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