One can buy perfectly good electret elements from AllElectronics.com for $0.50 each. I bought two, one to use to replace the failed microphone in a local ham's 10 meter transceiver, a Radio Shack (Uniden) HTX-100. Ken W7EKB --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus