[AMRadio] Crystal Mic Elements

D. Chester k4kyv at charter.net
Mon Dec 10 16:36:13 EST 2007

>  The Heil D104
> Replacement element for the D104 sounds really good.. go to
> www.heilsound.com and go to the amateur page and you will find it...
> Bob W1PE

I think the Heil replacement is actually a dynamic instead of the original 
crystal.  I seem to recall seeing some specs on it, and it pretty well cuts 
everything off below about 300~.  The original Astatic xtal element responds 
down to 100~ or below, if you work it into a 5-10 megohm load.

If Bob Heil got enough requests, he might be willing to custom make one with 
good  low frequency response while keeping the characteristic D-104 
acoustical presence rise.

Don k4kyv 

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