[Central-Electronics] D-104 mic problem solved

[Jim Candela]

Dave,

    Sometimes you can fix a defective D104 element. Take the foil cone off 
very carefully, and have a good look inside. I did this once where the 
problem was the rod going to the foil was detached at the crystal end. I 
re-attached it with a drop of candle wax. The Mic worked well for several 
months afterward. Then summer hit, and my garage hamshack got really hot. 
That was the end of that element. There are two Astatic MC320 elements on 
Ebay right now:

120618755358
110583499399

Good Luck,
Jim
WD5JKO


----- Original Message ----- 
From: "Dave Plowman" <daveplowman at verizon.net>
To: <central-electronics at mailman.qth.net>
Sent: Monday, September 06, 2010 7:04 PM
Subject: [Central-Electronics] D-104 mic problem solved


> First, thanks for all the suggestions and help.
> Just as I initially suspected, it turns out that the cartridge is bad.
> I decided I had nothing to lose so took peek under the foil cone and sure 
> enough everything was corroded and the leads were not even attached to the 
> inside of the foil cone, it's bad!!
> It is an Astatic cartridge but no identifying numbers just a patent label.
> Now, what to do next.
> I have quite a few good high impedance mics but really wanted an original 
> D-104 just because of the tradition and the fact that I have never owned 
> own in over 50 yrs in the hobby.
> I would really like to keep this mic authentic so where do I go for a real 
> Astatic cartridge and which do I select if I find one, ceramic or crystal?
> So the saga continues and would really love some more help in making this 
> decision to keep this mic authentic.
> Oh, almost forgot, I am looking for an original manual my CE MM-2 rf 
> analyzer scope, not a copy.
> Thanks & 73
> Dave
> W4PBU
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