My mention in SolderSmoke # 132 of this technique to custom tailor the AF response of crystal mic elements has already generated a lot of interest. Here's the e-mail from Italy that alerted me to the work of Dr. Andrea Bugiardo:
http://soldersmoke.com/microphone.htm
Check it out!
Re: EF JOHNSON HISTORICAL TREASURE CHEST
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The problem with many of Johnson's original manuals was that many of the
page sheets were printed on acidic-type paper. After 60 plus years, sheet
color tu...
12 minutes ago