Andy... I have one on my 756Pro, and sold the Heil.
I also use one on several other rigs..both tube and solid state.

Did you have to do anything special to the mic to get it to work?

Used in tube-only rigs??? Someone's been living in a closet!!
...Dave

There's a few guys on these newsgroups that are living in the closet, but I
won't name any names.
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73! de Andy KC2SSB
Beachwood, NJ USA! Grid FM29vw
http://vhfradiobuff.tripod.com