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Scratching the head for old memories, I seem to recall that the entire series was pretty much identical. Mostly cosmetic differences, like the 401 vs the 401A, which simply had changed from inch calibrations to centimeter. I have owned several of these and don't recall any real differences. Maybe the H had higher sensitivity but I'm treading on thin ground here. Bandwidth on the entire series was about 100 kHz oops I mean 100 kc. I may still have some manuals.
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