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I recently had no audio drive. I bought a new electret microphone element at RS and rewired and installed the identical looking little unit. My question is, does anyone know the spec of the OEM device? Impedence? Gain? Freq response? Any other variable I should know before deciding to stay with what I bought (it works) or purchase a different one. The RS spec is: f resp. 50-10k, supply voltage 1-10vdc, nominal supply, 4.5vdc, current drain .5ma (max), s/n 58db (min), sensitivity -44 +/- 2db and output impedence 2.2k ohms. Thanks WA1MAD