Re: [AMRadio] Crystal Mic Elements

2007-12-13 Thread Brett Gazdzinski
I have had the same D104 for the last 25 years at least.
I got it new from AES I think, and it still works good as new,
despite the abuse.

A very good microphone to use with some rigs like
the 32v3, with mods to the radio.

My D104 has a grey uncoiled cord, and when I tried putting
a longer cord on it (only a few feet longer) it lost all its high
end!

These things are very high impiedance!

Brett
N2DTS

- Original Message - 
From: "D. Chester" <[EMAIL PROTECTED]>
To: 
Sent: Monday, December 10, 2007 4:21 PM
Subject: Re: [AMRadio] Crystal Mic Elements


> I understand that Astatic will replace the mic element if you send the old
> mic back to them for repair.  They will charge you for the new element
plus
> installation fee, likely to be as much or more than the element itself.  I
> wouldn't send them one of my pre-1937 1-inch thick mic heads though.  They
> might not re-assemble it with all the original hardware, they might damage
> it or worse still, the old mic head might be considered a 'core
replacement'
> and I would get back someone else's new style head with a new element in
it.
> One option would be to send a spare usused later model head and when I got
> it back, swap it out with the one in my older version.
>
> A  spare mic head should be no different whether kept "n.o.s" in the
> original unopened box or installed in a microphone.  I don't think
> connecting a microphone to a rig could cause any additional wear and tear
on
> the microphone, other than possible damage from being dropped.  I have
> several D-104's with good elements and they all work OK.  The last time I
> bought a  new element from Astatic was sometime about 1990.
>
> I once saw a Japanese reproduction D-104 at a hamfest.  It looked
identical
> to the original, except for the name plate, and the screws that hold the
> head together which were phillips-head instead of slotted.  Of course, I
> have no idea if the element inside was the same thing.  If so, they might
> still have replacement elements, but I wouldn't count on it being
identical
> to or as good as an original Astatic.
>
> As popular as those mics have been ever since 1933, you would think that
by
> now someone would be manufacturing low-cost after-market elements that
would
> be identical to and as good as the originals, just like they do automotive
> parts.
>
> Don k4kyv
>
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RE: [AMRadio] Crystal Mic Elements

2007-12-10 Thread Bob Peters
The volumax went away and OK on tubes right now...Just got the meter
today...

Bob

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, December 10, 2007 7:17 PM
To: amradio@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 <[EMAIL PROTECTED]>
To: 'Discussion of AM Radio in the Amateur Service' 

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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, December 10, 2007 6:04 PM
To: amradio@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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Re: [AMRadio] Crystal Mic Elements

2007-12-10 Thread SBJohnston
[EMAIL PROTECTED] writes:

> Rat Shack (aka Radio Shack) crystal elements 

Yes, those RS units were quite good - I should have bought a bunch of them 
when they were available.  I have one here I found in an old handset I built as 
a kid, and I have it in the drawer for the next crystal mic I need.

Steve WD8DAS




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Re: [AMRadio] Crystal Mic Elements

2007-12-10 Thread cemilton

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 <[EMAIL PROTECTED]>
To: 'Discussion of AM Radio in the Amateur Service' 


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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, December 10, 2007 6:04 PM
To: amradio@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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Re: [AMRadio] Crystal Mic Elements

2007-12-10 Thread cemilton
Some of the mic elements available for a "reasonable" (read this cheap) 
price perform fb and others do not.  It's often a matter of checking 
them through a good amplifier and watching the upper and lower levels 
of response.  I'm fortunate to have an original D-104 that sounds great 
and meets the specs it was originally designed for.  That said, I've 
had more than one of the "MOUSER" elements along with some old Rat 
Shack (aka Radio Shack) crystal elements that sounded just as good as 
the original D-104.


I have a JT-30 Astatic and a Turner S22X(3) with the original elements 
that are still performing nicely.  Wouldn't think of converting them to 
a condenser or dynamic mic.


And, without condescension intended, the human voice is the beginning 
of a microphone sounding good.  Some voices just plain sound crappy, 
regardless of the mic used.  No external device will improve that 
situation.  I speak from having listened (and engineered) any number of 
announcers in AM broadcast radio.  We hams ain't much different.  
That's why some of the best audio reports come from simple mics like 
the D-104 and an even simpler 2-stage amp using 12AX7's in something 
like a DX-100 or the Viking II.  The difference is often in the voice 
of the operator.


Well, enuf of my comments.

YMMV

73 de W4MIL
Chuck
Palm Coast, FL

Oh, BTW, a very Merry Christmas to y'all.  And a better 2008.








-Original Message-
From: [EMAIL PROTECTED]
To: amradio@mailman.qth.net
Sent: Mon, 10 Dec 2007 7:03 pm
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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RE: [AMRadio] Crystal Mic Elements

2007-12-10 Thread Bob Peters
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: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, December 10, 2007 6:04 PM
To: amradio@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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Re: [AMRadio] Crystal Mic Elements

2007-12-10 Thread SBJohnston

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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Re: [AMRadio] Crystal Mic Elements

2007-12-10 Thread D. Chester




 The Heil D104
Replacement element for the D104 sounds really good.. go to
www.heilsound.com and go to the amateur page and you will find it...

Bob W1PE


I think the Heil replacement is actually a dynamic instead of the original 
crystal.  I seem to recall seeing some specs on it, and it pretty well cuts 
everything off below about 300~.  The original Astatic xtal element responds 
down to 100~ or below, if you work it into a 5-10 megohm load.


If Bob Heil got enough requests, he might be willing to custom make one with 
good  low frequency response while keeping the characteristic D-104 
acoustical presence rise.


Don k4kyv 


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Re: [AMRadio] Crystal Mic Elements

2007-12-10 Thread D. Chester
I understand that Astatic will replace the mic element if you send the old 
mic back to them for repair.  They will charge you for the new element plus 
installation fee, likely to be as much or more than the element itself.  I 
wouldn't send them one of my pre-1937 1-inch thick mic heads though.  They 
might not re-assemble it with all the original hardware, they might damage 
it or worse still, the old mic head might be considered a 'core replacement' 
and I would get back someone else's new style head with a new element in it. 
One option would be to send a spare usused later model head and when I got 
it back, swap it out with the one in my older version.


A  spare mic head should be no different whether kept "n.o.s" in the 
original unopened box or installed in a microphone.  I don't think 
connecting a microphone to a rig could cause any additional wear and tear on 
the microphone, other than possible damage from being dropped.  I have 
several D-104's with good elements and they all work OK.  The last time I 
bought a  new element from Astatic was sometime about 1990.


I once saw a Japanese reproduction D-104 at a hamfest.  It looked identical 
to the original, except for the name plate, and the screws that hold the 
head together which were phillips-head instead of slotted.  Of course, I 
have no idea if the element inside was the same thing.  If so, they might 
still have replacement elements, but I wouldn't count on it being identical 
to or as good as an original Astatic.


As popular as those mics have been ever since 1933, you would think that by 
now someone would be manufacturing low-cost after-market elements that would 
be identical to and as good as the originals, just like they do automotive 
parts.


Don k4kyv 


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RE: [AMRadio] Crystal Mic Elements

2007-12-10 Thread John Coleman
Thanks to all that replied about the microphone elements.

I have some stuff to look at now.

John


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RE: [AMRadio] Crystal Mic Elements for Otis

2007-12-10 Thread John Coleman
Otis left them out in the shack and I guess the heat and cold got them.
I loaned him one and he was going to get on the air Sunday morning but said
the RCVR didn't work all the time. So I need to make another trip out and
see what's wrong there. 

For those that don't know, Otis, K5SWK, uses the elements in an old RCA
housing not the D104 housing.  He can't use a dynamic of any kind as there
is way to much magnetic hum floating around his shack.  I will probably
build him a condenser circuit for the RCA housing soon while he uses my D104
and is in the mood, so to speak.  Mean while I thought it would be a good
idea to get his two D104s all up and running again.
  

John

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Geoff/W5OMR
Sent: Saturday, December 08, 2007 6:56 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Crystal Mic Elements

John Coleman wrote:
> Does anyone know if someone is making and selling the cartridges for the
> D104.
>   

I thought we went thought all that, a few years ago, and Otis bought a 
few (several?) Crystal Element cartridges.

Does he have any left?  Time to go visit the Ancient One, anyway...

-- 
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)

--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Crystal Mic Elements

2007-12-09 Thread Tom Chesek
That is my experience with the Kobitone 25k element from Mouser. It was
worth what I paid. I bought 3 with the idea of "refreshing" my 3 D104's.
Although each of the D104's original elements sound differently they still
have better sound then the new Kobitone elements. Bob's idea about the Heil
make sense. You get what you pay for.

Tom K3TVC


- Original Message - 
From: "Bob Peters" <[EMAIL PROTECTED]>
To: "'Discussion of AM Radio in the Amateur Service'"

Sent: Saturday, December 08, 2007 7:06 PM
Subject: RE: [AMRadio] Crystal Mic Elements


> John...The Mouser element is really pretty bad audio quality but what
> can you expect for a buck. The Heil D104
> Replacement element for the D104 sounds really good.. go to
> www.heilsound.com and go to the amateur page and you will find it...
>
> Bob W1PE
>
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of John Coleman
> Sent: Saturday, December 08, 2007 5:29 PM
> To: 'Discussion of AM Radio in the Amateur Service'
> Subject: [AMRadio] Crystal Mic Elements
>
> Does anyone know if someone is making and selling the cartridges for the
> D104.
>
>
> John, WA5BXO
>
>
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Re: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Robert Lawson
And as usual, we hams have always come up with a back channel / back 
door of ways to make things work cheaper and as good at least and often 
times better.  It's the spirit of our fraternity from our beginning, 
isn't it.  I personally hated it when Astatic pulled the D-104 crystal 
element plug for us, but we will survive with all the fellas trying to 
see what goes with the 'other' elements now on the market with which 
they experiment.I have two JT-30's but am embarrassed to say that I 
have never put them on the air. 

Wish me luck with my Audio-Technica ATR30 30 dollar venture.  It 
certainly is built very well and has great looks.  I will wire it up soon. 

73 Robert W4RL 




Geoff/W5OMR wrote:

Robert Lawson wrote:

Geoff,

Yep, "we" did go through that a few years ago at length,


When I said "we", I was referring to John/BXO and I (as in replying to 
his message).  John, Otis, and someone else, forget now who it was... 
Steve/K5LTK, perhaps, ordered some D-104 cartridges.  In fact, I think 
they were the JT-30 replacement crystal cartridges, which have a very 
similar sound to them, if not a bit 'richer'.


With the right amount of EQ, any microphone can be made to sound -at 
least- acceptable on the air.


John, in particular, came up with an RC network, incorporating some 
inverse feed-back on a 12AX7 mic preamp that flattens out the audio 
response on most any crystal element mic (like a D-104 or JT-30, etc...)

http://www.qsl.net/wa5bxo/xtal-mic-eq.gif



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Re: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Geoff/W5OMR

Robert Lawson wrote:

Geoff,

Yep, "we" did go through that a few years ago at length,


When I said "we", I was referring to John/BXO and I (as in replying to 
his message).  John, Otis, and someone else, forget now who it was... 
Steve/K5LTK, perhaps, ordered some D-104 cartridges.  In fact, I think 
they were the JT-30 replacement crystal cartridges, which have a very 
similar sound to them, if not a bit 'richer'.


With the right amount of EQ, any microphone can be made to sound -at 
least- acceptable on the air.


John, in particular, came up with an RC network, incorporating some 
inverse feed-back on a 12AX7 mic preamp that flattens out the audio 
response on most any crystal element mic (like a D-104 or JT-30, etc...)

http://www.qsl.net/wa5bxo/xtal-mic-eq.gif


--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Greg

I don't think anyone is making exact replacements for the D 104.
The orignal element is very large so I don't think anyone wants to tool up 
for it.
Kobetone makes a hi z crystal cartridge that will work ok in a D 104 head. 
It's small enough to fit into the Turner Centurion Head type mics too.

Kobetone is sold thru Mouser at around $4 unit.
73's
Greg
WA7LYO
Kinston NV
- Original Message - 
From: "John Coleman" <[EMAIL PROTECTED]>
To: "'Discussion of AM Radio in the Amateur Service'" 


Sent: Saturday, December 08, 2007 6:29 PM
Subject: [AMRadio] Crystal Mic Elements



Does anyone know if someone is making and selling the cartridges for the
D104.


John, WA5BXO


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Re: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Robert Lawson

Geoff,

Yep, "we" did go through that a few years ago at length, but it seems 
there are some "'new' to D-104 crystal element replacement" ham radio 
fraternity members joining in such queries to our aging AM affectionatos 
with patient answers and suggestions.  Don't know about Otis.  Would not 
want an old stock one anyway now.  Things just change in this world, 
just like us physically. 


Regards and Merry Christmas to you and yours.

Robert W4RL

PS,  Bob W1PE was there not an article in QST some time back that 
featured a homemade microphone with a 'cheap' element?  I'll have to go 
and find it. 

Of note to all, I purchased an Audio-Technica ATR30 from J&R Music World 
Computer World for 30 dollars shipped that I am matching to my Icom 756 
Pro 3 and then to my BA gear transmitters.  More than half the fun in my 
ham radio hobby is "tho'in a rock into the woods and see what moves"  
with my radio experimentations.  Keeps the 'what if' ham radio energy 
flowing in this old timer.  HI




Geoff/W5OMR wrote:

John Coleman wrote:

Does anyone know if someone is making and selling the cartridges for the
D104.
  


I thought we went thought all that, a few years ago, and Otis bought a 
few (several?) Crystal Element cartridges.


Does he have any left?  Time to go visit the Ancient One, anyway...


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Re: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Geoff/W5OMR

John Coleman wrote:

Does anyone know if someone is making and selling the cartridges for the
D104.
  


I thought we went thought all that, a few years ago, and Otis bought a 
few (several?) Crystal Element cartridges.


Does he have any left?  Time to go visit the Ancient One, anyway...

--
Driving your AM Rig without a scope, 
is like driving your car at night, without headlights. (K4KYV)


--
73 = Best Regards,
-Geoff/W5OMR

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Re: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Jim Wilhite


John if you want originality, then contact Astatic.  They had a mail in 
deal for about 40 bucks which included return postage sometime back.  I 
had them do one of mine.


Don't have the web site at my fingertips but you can search for them and 
look for the "contact' page.  Email them and they will tell you.


Jim/W5JO




Does anyone know if someone is making and selling the cartridges for 
the

D104.


John, WA5BXO




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RE: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Bob Peters
John...The Mouser element is really pretty bad audio quality but what
can you expect for a buck. The Heil D104 
Replacement element for the D104 sounds really good.. go to
www.heilsound.com and go to the amateur page and you will find it...

Bob W1PE

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of John Coleman
Sent: Saturday, December 08, 2007 5:29 PM
To: 'Discussion of AM Radio in the Amateur Service'
Subject: [AMRadio] Crystal Mic Elements

Does anyone know if someone is making and selling the cartridges for the
D104.


John, WA5BXO


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Re: [AMRadio] Crystal Mic Elements

2007-12-08 Thread Robert Lawson
John, as far I know Astatic has not manufactured them in several years.  
There are though some fellas who have replaced the 104 crystal or 
ceramic element with a wide variety of elements ranging for Radio Shack, 
those supplies by Mouser Electronics, and Heil microphone HC-4/5 
elements with appropriate impedance transformations/preamp's I think 
with Heil.
I remember a contact on AM with a ham who was using a 3 dollar crystal 
element from Mouser. 


Hope this helps.

73 es Merry Christmas

Robert W4RL



John Coleman wrote:

Does anyone know if someone is making and selling the cartridges for the
D104.


John, WA5BXO


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