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What does EV/EB mean ? Just wondering?

I am not sure there is an easy answer to this question but I thought I would ask anyway.
What is the translation/significance or meaning of the EB/ev suffix? I gather from the context it is roughly equivalent to our "A" suffix, meaning "heavy duty". There are a number of designations out there in tube land which don't signify all that much, but in this case it has a very important meaning. I don't know what if any structural differences there are between the basic tube and the EB/EV version? Anybody know?

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