[AMRadio] Xtal mike

Bob Bruhns bbruhns at erols.com
Mon Mar 14 22:45:05 EST 2005

Hi Steve,

An Astatic D-104 is a very good crystal mike.  You can also get
Kobitone crystal mike cartridges from Mouser Electronics

Check out the Kobitone 25LM024 cartridge (in stock, $4.17 in
single-unit quantities), it has a wide peak around 3 KHz, which is
right where you want it. The datasheet for this cartridge is
available in pdf form from the Mouser site.

The peak at 3 KHz, and the high output into high impedance tube grid
circuits, are good reasons to use this kind of crystal mike.  To
really get the low end with a crystal mike, you need a grid resistor
of at least 1 meg, and preferably 10 or 15 megs.

  Bacon, WA3WDR

----- Original Message ----- 
From: <StephenTetorka at cs.com>
To: <amradio at mailman.qth.net>
Sent: Monday, March 14, 2005 12:24 PM
Subject: [AMRadio] Xtal mike

> Excuse me...'senior moment'...I need one...anyone have one for
> Tnx,
> Steve
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