Most D-104 mikes are not suited for use with today's radios. The
original D-104 was designed to work into a load impedance of 4 meg-ohms
or higher. Today's radios microphone input is about 50k ohms or so.
The result is then excessive load on the D-104 element. This is the
major cause of frequency response issues.
The D-104 with the TG stand {amplified mike stand} uses the FET device
as a buffer, thus it is providing a very high impedance for the mike
element and adequate gain to drive a 50k ohm or lower microphone input.
As to replacing the D-104 element, if yours has output, likely it is OK
and is suffering from the issue of improper load on the element.
Remember, this mike was designed to operate with tube type microphone
amplifiers, having an input impedance of several meg-ohms.
The D-104 on my TUG8 stand has the original Rochelle salt element and
the FET amplifier in the base. It sounds great on any of my radios. My
comment is that one should use the mike such that moisture or spittal
from the mouth does not accumulate on the mike face and element. Also
don't leave it in a position where the equipment will heat the D-104
above room temperature and surely left in the direct sun.
I frequently hear hams talking about using a D-104 with a Heil
element. Fact is, it no longer is a D-104, it is a Heil HC-4 or HC-5
or whatever.
73
Bob, K4TAX
On 2/23/2022 1:57 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 2
Date: Tue, 22 Feb 2022 17:35:58 -0500
From: Dean Adinolfi<kd3...@gmail.com>
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] D-104 Mic Element Replacement
Message-ID:
<CAD3T48KMu4JSn8rctBx2L_WQdOq6m+MpPu9tq=o3aujrgae...@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
W2ENY element works great.
https://www.w2eny.com/
Dean, KD3ANX
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