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Along with better X-ray protection the later HV tubes also had modifications for better performance and even physical improvements, such as the 6ME6 (6MJ6?) replacement for 6JE6C horizontal output tube having a plate cap molded into the glass like a 6BK4 so it can't twist off. I would only use 6BK4C/6EL4A and 3A3C.
Some older types of HV rectifier tubes also had problems like sagging filaments causing shorts which were corrected in later versions.
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