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Is it a metal tube?? In a glancing search I didn't see any reference to a metal 12W6 but did see 12L6 which, being a variant of 25L6 (not 6L6), would differ from the 12W6 in designation only, they're really the same tube. In any event, the electrical specs between metal/GT/G/whatever tubes of the same type will certainly be identical and in that application I'd expect them to sub interchangeably.
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