One of our locals picked up 4 valves yesterday (tetrodes). They are about
the same size as a 4CX400, they are gold plated, coaxial, marked 4685 and
4HC170J. Manufacturers are ITT and RCA. They have a plate at the top of the
anode with two holes in, presumably to attach a line to.
Does anyone have any ideas/data about these?
Thanks in advance
73
Peter G3RZP
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