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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