UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Bazz4CQJ · 26th Aug 2020, 3:29 am

Nope, you are indeed right about the Rochelle salt microphones; these salts are deliquescent. It's quite hard to believe they could have used them for manufacture in the first place. The Rochelle salts were eventually phased out in the late 50's when more stable materials were introduced (the first Shure mics in '57). However, I think it is the case that all of these Piezo mics were just referred to as crystal mics, so for vintage mics from certain period of time they might have been made of either the early or later types of materials. Paying good money for such would be a bit of a lucky dip!

B

26th Aug 2020, 3:29 am	#14
Bazz4CQJ Dekatron Join Date: Apr 2009 Location: Oxfordshire, UK. Posts: 4,935	Re: Codar AT5 TX Nope, you are indeed right about the Rochelle salt microphones; these salts are deliquescent. It's quite hard to believe they could have used them for manufacture in the first place. The Rochelle salts were eventually phased out in the late 50's when more stable materials were introduced (the first Shure mics in '57). However, I think it is the case that all of these Piezo mics were just referred to as crystal mics, so for vintage mics from certain period of time they might have been made of either the early or later types of materials. Paying good money for such would be a bit of a lucky dip! B __________________ Saturn V had 6 million pounds of fuel. It would take thirty thousand strong men to lift it an inch.