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Lower Purity W: Good? Bad? Neither?

I can understand how lower purity might lead to higher cold resistance but in this case it also leads to lower cold inrush current (a good thing?) and somewhat longer warmup time. I would think that lower purity would also lead to higher hot resistance too but this is not the case in the 2 samples I measured. Could this be intentional so that the term "lower purity" is not a negative characteristic but rather just a different filament alloy designed to achieve reduced cold inrush current and longer warm-up characteristics???

Actually, my observation is that ALL Russian tubes take a longer time for complete warm-up, esp 6550 types and EL84M. I'm going to make the same typ of measurements on these tubes when I get the time.

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