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None of the questions marks (aka more info buttons) next to the measurements actually give additional info on how they came to any of these measurements or conclusions regarding "tonality" or noise.
So I wasted a few dollars on some new tubes and ran some tests. Here's my comparison of their comparison:
As I suspected, their charts are meaningless. Tubes have datasheets with curves for a reason. Sometimes manufacturers flub their datasheets to make mediocre tubes look better, but that's why you never look at only one datasheet for a tube type to get your data. The curve traces show how the tubes behave in the real world, with real voltages, and there is a variance of performance there.
The "tonality" of the tube is highly subjective, and also subject to the circuit it's tested in. If you blind test 100 of each tube with a room of 100 people listening, I would be surprised if the data collected actually produces meaningful results.
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