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In Reply to: do you know the maker of this 6sl7gt? thanks posted by bouncy ball on March 28, 2015 at 08:40:22:
National Union made both grey and black glass tubes in this type. This one looks like a black-glass NU tube. (grey glass NU were earlier than the black glass ones)
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- RE: do you know the maker of this 6sl7gt? thanks - Ed Sawyer 13:20:06 03/30/15 (0)