Thread: 6BK4 versus 6BK4A
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Old 05-09-2006, 12:18 PM
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mhardy6647 mhardy6647 is offline
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Join Date: Sep 2002
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Just a wild-guess... perhaps they improved the lead-glass shielding to reduce X-ray emissions from the tube? Color TV x-rays were a big deal sometime in the late-1960's as I recall.
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