On Feb 28, 2010, at 10:13 PM, Hulett, Russell wrote:
Trying out my T-4X on SSB, using an old D-104 microphone with T-UG8
stand. Comments were audio was ok but sounded like I was "in a
tunnel". Another mentioned that the audio was higher pitched than
my other rigs. My T-4XB never received any similar reports, though
the microphone used with that rig is a D-104 on a G base
Since they are easily swapped, try changing the heads and see what
happens. There were two versions of the D-104 head, and a pin
compatible dynamic mic, the 10-DA. The 10-DA looks like a bullet head,
the D-104's are the lollypops.
The 10-DA has much better bass response, and works well for me, having
a very low voice. The D-104's two versions have much higher response
and less bass. One is the usual crystal one, which is the most popular
and the best sounding. There was also a ceramic version which had a
narrower response, but was harder to damage and had less problems with
humidity.
The D-104 inside had a black grill cloth and then a layer of
fiberglass insulation. These adjusted the frequency response of the
microphone. There are lots of "improvement" mods floating around, some
modify the cartridge itself, others replace or remove the grill cloth
and the fiberglass. AFAIK, removing the grill cloth does nothing to
(or for) the sound, modifying the fiberglass has a big effect.
There were also many D-104 "clones" or similar microphones in D-104
cases, etc.
It's possible that one mic is a stock D-104, the other has a crystal
or modified head, or a "clone".
Then there is the issue of the amplifer.
From what I understand (Garey help!!) the impedance of the D-104 is a
good match to the impedance of any of the Drake tube gear and no
amplifer is needed. The amplifer was designed as an impedance matching
device, not a gain producing device, although it does have some gain.
If you have an amplified stand, make sure the battery is fresh and the
gain is relatively low (1/2 way or less). Even better, remove the
battery and
jumper out the amplifer completely. I can't guarentee that it works
for all Drake rigs, I've only owned transistorized ones.
I hope that helps. Good luck and 73,
Geoff.
--
geoffrey mendelson N3OWJ/4X1GM
Jerusalem Israel [email protected]
New word I coined 12/13/09, "Sub-Wikipedia" adj, describing knowledge
or understanding, as in he has a sub-wikipedia understanding of the
situation. i.e possessing less facts or information than can be found
in the Wikipedia.
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