[Boatanchors] D-104 Replacement Element

[David Harmon]

It IS ancient history.....but a few of the posts I have been reading in this
thread convinces me that not everyone knows it.
Richard's mic 101 class helps with an understanding for those who don't know
that they don't know anything about mic impedance....
Now all we gotta do is convince Richard to put his responses at the TOP of
the page instead of the bottom...lol
Normally I delete his posts without reading because of this in spite of
wanting to read what he says......don't know why I read this one.


73

David Harmon
K6XYZ
Sperry, OK

-----Original Message-----
From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of
Rob Atkinson
Sent: Tuesday, June 17, 2014 12:00 PM
To: Richard Knoppow
Cc: Boatanchors List
Subject: Re: [Boatanchors] D-104 Replacement Element

On Tue, Jun 17, 2014 at 11:07 AM, Richard Knoppow <1oldlens1 at ix.netcom.com>
wrote:

>    All of these have been pretty much replaced by other types of 
> elements since the cost of amplification is now insignificant.
>    Most crystal mics were intended to be worked into an "unloaded 
> grid", meaning something like a tube amp with a grid leak and input 
> resistance of at least a megohm.

You make it sound like a xtal D104 into a 5 or 10 meg grid is ancient
history.  I know lots of phone ops who run D104s like that.

They sound great provided the grid resistor is very high value resistance.

73

Rob
K5UJ
______________________________________________________________
Boatanchors mailing list
Home: http://mailman.qth.net/mailman/listinfo/boatanchors
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Boatanchors at mailman.qth.net

List Administrator: Duane Fischer, W8DBF
** For Assistance: dfischer at usol.com **


This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html