I did some testing today and I think that strange effect I saw was in fact a cable problem -- I couldn't reproduce exactly the same effect, but in gently wiggling one of the cables to the counter I was able to get some oddball readings.

A couple of unrelated points -- I wasn't sure about this, but have verified that the FTS tube installed in my 5061A has the same C field sensitivity (8x10e-14 per minor division) as the original HP tube. And, having now seen the FTS instructions for retrofitting their tube in the HP chassis, I can verify that the Zeeman frequency for the FTS tube is supposed to be 42.82kHz.

John

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