Fantastic!! Thanks for doing that, this is really helpful.
The values marked "off" in the list - that should instead be the 10k setting on the tester, right? (they look pretty close to what I would expect for 10k, so just want to confirm)
The "M" setting on the tester is sort of a substitute for getting the true Vgs(off) value of the JFET. It uses the multimeter's internal resistance, which is usually around 10M. So it's very, very close to the true Vgs(off) value, probably within a few millivolts, but is technically more accurately called Vgs(10M) or just Vgs(M).
Q5 is a bit farther out of line from the others on the Vgs(10k) value, but still would probably work fine and is most likely correct. I have a '79 Phase 90 with all JFETs within 0.1V and it sounds great. A spread of 0.18V for the AP-7 is a bit wider than that, and if I was making one I'd want them to be tighter, but hard to argue with the manufacturer on what's acceptable
