Rhodesplyr, to my understanding, that is indeed why they put the grid connection on top. (Believe it or not, the thing about heavy electrons was a troll. )
Here's what the (British) National Valve Museum has to say about the 6J7/EF37.
http://www.r-type.org/exhib/aaa0625.htm
Here's what the (British) National Valve Museum has to say about the 6J7/EF37.
http://www.r-type.org/exhib/aaa0625.htm
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