[AMRadio] Crystal Mic Elements


Bob Peters rwpeters at swbell.net
Mon Dec 10 20:23:57 EST 2007


The volumax went away and OK on tubes right now...Just got the meter
today...

Bob

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of cemilton at aol.com
Sent: Monday, December 10, 2007 7:17 PM
To: amradio at mailman.qth.net
Subject: Re: [AMRadio] Crystal Mic Elements

Hello Bob,

Two items............. Do you still have the CBS Volumax for sale?  How 
much?

Do you still need tubes for the Gonset G-76?  BTW, why am I thinking 
the modulators and final are different.  I sold my G-76 (kick my ass 
for doing so) but I have extra tubes in the shack.  I vaguely remember 
the modulators and final as being different.  Correct me accordingly.

And remind me abt the screen resistor "glitch" between schematic and 
production units.  Gave me hell for an hour or so.

73 de W4MIL
Chuck
Palm Coast, FL





-----Original Message-----
From: Bob Peters <rwpeters at swbell.net>
To: 'Discussion of AM Radio in the Amateur Service' 
<amradio at mailman.qth.net>
Sent: Mon, 10 Dec 2007 7:44 pm
Subject: RE: [AMRadio] Crystal Mic Elements

A Comment on your E mail...The Behringer is  a great little box
especially for the money. But if you want
A really great sounding D-104 go to the K7DYY site and check out his
board. Guys let me tell you I have a D104
And a 10DA with Bruces board on board and guys say that it sounds like
WBAP AM. I have a lot of high doller gear
And love what Bruce has done. Check with Brian WA5AM on how he thinks
the quality is. Bruce has a number of options
On it...I sent my mic to him and let him do his thing...His Web site is
www.k7dyy.com

All the best...

Bob W1PE

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of SBJohnston at aol.com
Sent: Monday, December 10, 2007 6:04 PM
To: amradio at mailman.qth.net
Subject: Re: [AMRadio] Crystal Mic Elements


So far I've not found the crystal mic elements from Mouser, "Kobetone"
etc.,
to be really good enough to replace the D104 element, or even the
elements in
crystal mobile mics.  I don't think their diaphragms are big enough.

The original D104 is prized because it has good low-end response, and a
preemphasis rise in the upper-midrange.  You can use it with an
otherwise flat
transmitter and get decent results without any extra EQ gadgets.

Rather than use a sub-optimum crystal element to replace a bad D104, I'd

consider using one of the $1 consenser elements in the head and use
external EQ,
or maybe a circuit in the base of the G-stand, to get the rising
response
characteristic.

A side note:  For a real bargain in a pro-quality mic look at the
Behringer
C-1 as shown at  http://www.bswusa.com/proditem.asp?item=C-1
$40 is *very* cheap for such a good-sounding mic.  But keep in mind its
response is essentially flat, not like a D104, and it needs
phantom-power.

Steve WD8DAS




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