The proset as currently supplied has the Heil electret element which:
(a) requires a source of bias via a dropping resistor (see the SSB
manual), and,
(b) has greater output than the Heil HC-4 and HC-5 dynamic elements.
I mounted HC-4 and a HC-5 elements within an old Shure 444D stand
(element selectable via a miniature DPDT switch mounted through the top
of the mike head) and managed to fit a one transistor preamp in the
base. Circuit for preamp is on the Elecraft site. Seems to work OK.
73
Kevin
VK3DAP / ZL2DAP
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