Vintage crystal microphone: specifications?

Thread Starter

Lectraplayer

Joined Jan 2, 2015
116
I'm trying to figure out if a crystal microphone that was provided with a wire recorder is any good after some 60+ years, though I have yet to complete my restoration of the recorder itself, I have been trying to test the mic. At this point, I am thinking that it is dead based on simply plugging it into several tape players, computers, etc, I am not sure if crystal microphones take siginificantly more voltage to read properly, or if it actually is DOA. Anyone here have much experience with these old tin cans?
 

Audioguru again

Joined Oct 21, 2019
1,508
A crystal mic was a very high impedance, piezo type. It needs a preamp with a very high input impedance, maybe an electric guitar amp. Modern mics and preamps have a fairly low impedance.
 

Thread Starter

Lectraplayer

Joined Jan 2, 2015
116
I figured that much, though I didn't measure anything with my guitar amp. Have yet to put it on a scope though. I'm sure that will tell me for sure.
 
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