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I think it tests the same amount of tubes.Just the setup for some of them is different.I have both a 707 and a 747.The 707 I've had for years.It is in rather poor shape as I rescued it from the dirt in the basement of a retiring tv tech years ago.The case is literally falling apart but it works.Someday I'm going to restore the case.Inside it looks fine except a little rust on the top left corner.Would love to find a new manual for it also.It's in separate pages also.I recently got a nice 747 and haven't played with it much but notice that it tests all tubes with the dynamic Mutual Conductance test.The 707 tests the ones that plug into the bottom section with only an emission test.This includes all compactron tubes.I wonder what year each of the B&K testers were made?Seems like there were a lot of different models.I saw another old B&K an old tv tech had.It was a model 700.
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