I've been offered a couple of glass triodes, some shape and size as 3-500s
etc. The anode has several annular rings rather than the vertical grooves.
These are EEV manufacture, marked C.1112, date code is 1974. Does anyone
have any ancient data to see what they are please? They were wired up for
some sort of dc/lf switching, so I suspect they might be low mu and not
intended for rf. They come with nice looking ceramic 5 pin sockets - I'm
guessing that these are the same as the 3-500 etc. uses. Are the sockets
themselves worth anything?
Thanks,
Steve
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