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Serge Auckland wrote:
Very interesting, and thanks for the post. However, if I have understood
the graphs correctly, the MC graph shows no effect on frequency response
until well into rf. At af, it would seem that the response is identical
whatever the load.

I'm not sure why anyone would find this at all surprising. Fact
is, the effective source impedance of most moving coil cartridges
is several orders of magnitude lower than most moving magnet
cartridges, Thus, for the same reactive loading (effectively a
parallel combination of a shunt capacitance but an appropriate
load resistance), the effects should be correspondingly higher
in frequency.