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the late 60's Zenith tv chassis service manuals will suggest that any tv using the shunt regulator tube brought in for service using the 6BK4 be inspected replaced with the new and improved 6BK4C or 6EL4 for better x-ray protection.
There is more lead in the 6bk4c and 6el4. You can feel the difference in weight when comparing the the standard 6BK4 or 6BK4B.
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