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6BK4/high voltage regulator tubes
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03-01-2005, 09:24 PM
maxm
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Join Date: Feb 2004
Location: Chicago
Posts: 366
I believe that in the "C" verion of the 6BK4 they switched to leaded glass, to fend off the radiation scare. In a tube manual I have, it warns about always switching out this tube to the newer one to make the set safer.
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