Cool - didn't know that! I have been impressed with the 658A. It's a much older machine than the B&K 747, yet it seems to be able to test a lot more tubes. I've actually found a few mistakes in the B&K tube test settings for some tubes. It's fine for the prevalent tubes, but something out of the ordinary the Jackson just takes in stride. I have to make adjustments on the B&K, though.
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