Re: UY41 Valve.
According to the code list they always remained separate types (2 main versions of each, possibly one with a fritted construction and one with a melted construction). I seem to remember having heard that one or both tubes were at some point in time improved to have the best of both worlds. Since this isn't confirmed by the codes I would take it as just a rumour. If for example the valve books give higher voltage specs for later date UY42, that would confirm it.
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