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I suppose you mean the D-104-C? In catalog 197 it is listed only 3 dB lower than the crystal version. Interestingly they don't specifically say which is in the T-UP9-D104 "Silver Eagle". That suggests to me that at some point they did begin to quietly phase out the crystal and replace them with ceramic. Who's going to know? You would have to open one up and few would want to do that. I have a garage sale find Golden Eagle and two T-UG8 models all gelded with the 470K resistor mod. I used the Golden Eagle on my TR7 for a while. I still plug it in now and then for fun. It looks like hell, the lacquer coating on the stand neck is trashed. I also have a NOS cartridge tucked away in a drawer but I'm not going to cut it open.

Maybe I'll replace those 470K resistors with low noise film resistors... :D

Admittedly it may be urban legend that the crystal cartridge was phased out in later years but I have heard and read about it being so since sometime in the late 70s. Another bit of lore is that you can "make it sound better" by poking a pin hole in the diaphragm but I think all of us here are smarter than that. Take it all for what it's worth.



Here's a reference that appears to be wrong based on catalog info:



Some nice pics on this page:



Does anyone remember seeing the D-104 on a short non-G stand (probably an E-1 stand) used as a broadcast mic in the SciFi channel Battlestar Galactica reboot?


73

-Jim
NU0C

On Fri, 23 Feb 2024 12:48:05 -0800
"Richard Knoppow" <1oldlens1@...> wrote:

>? ? ?Astatic made another model the C-104 with a ceramic element. Very
> similar except the output is about 10db lower. This is for the element
> alone. If there is an amplifier the output levels are probably the same.
> I have not searched for a data sheet on the C-104.
>? ? ?Astatic made ceramic versions of many of their crystal mics and
> crystal phono pickups. The ceramic has the advantage of not being
> vulnerable to heat or moisture.
>
> On 2/23/2024 8:51 AM, Jim Shorney wrote:
> >
> > My "secret" is to do away with the amplifier and replace it with a series 470K resistor. This is actually an old-timer's trick to mellow out the frequency response of the D-104 head. The amplifier is enhanced uselessness for our radios. It will happily drive just about any radio this way and you get rid of a failure point (actually two if you consider potential battery leakage). This works with any T-UGxx stand.
> >
> > My understanding is that later D-104 heads used a ceramic cartridge. The same fix applies. The D-104 head likes to see a high impedance load, the higher the better.
> >
> > I have three T-UGxx variants that I have done this to and tested on the air with good reports. And they can be used with VOX.
> >
> > 73
> >
> > -Jim
> > NU0C?
>



--

73

-Jim
NU0C