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One final (?) comment: if a circuit is properly designed, and calls for a particular component in the parts list, it should work properly with any component meeting those specifications. So tube selection shouldn't be necessary.
Having said that, the pressures of economics combined with the frequent incompetence of some engineers probably result in some marginal designs that won't work with the full spectrum of components. Worst case analysis was seldom used in commercial practice.
So measuring everything you can measure on a component can be useful, although one never knows what limits to use.
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