Are you referring to the original non amplified D104?  If so, there is no
replacement available.  There is a lengthy thread about a proposed
(dormant) project to recreate the element here:
https://www.worldwidedx.com/threads/d-104.241890/

Tim

On Tue, Feb 22, 2022 at 11:22 AM Wilson Lamb via Elecraft <
[email protected]> wrote:

>
> OK, discriminating operators, does anyone know of a good replacement D-104
> element.
> Yes, I have been on the web and see dynamic and electret replacements.  My
> uses don't involve electret empowered radios.
> I also see statements that all the ceramic replacements have been sold,
> but I hold out hope.
> Does anyone know of a good ceramic element?
> Does anyone know if the dynamic/transformer replacement is near the same
> sensitivity as the original crystal?
> I have three D-104, one of which was my dad's, from the 540s.  It's lost
> its midrange.
> Thanks,
> Wilson
> W4BOH
>
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