"I don't know if the poster was referring to it, but QST ran an article in a
December issue, I think 1972 but it might have been 1971, by someone from
Millen about their work on making a solid state version."

You get a gold star on the memory test. It was December of 1972. I think
it was titled "Anatomy of a Grid Dip Meter", and it was written by the chief
engineer at Millen, who had led the conversion team. It is a worthwhile
read for anyone who thinks of converting an rf device to solid state. In
particular, the simple rf choke became a substantial barrier. The end
result was multiple rf chokes and ferrite beades placed in just the right
order to work at all frequencies. I recall Millen worked for days on the
"simple" task of creating something that would work as an rf choke on all
frequencies.

Colin K7FM



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