Altec American Amperite BAF BBC BM9 Bang and Olufsen Beeb Beyer Bruno Cadenza Calrec Carbon mic Coil winding Coles Crystal DI box EMI EV Electrovoice Ervox Extinct Audio Fairchild Fender Ferrograph Fi-Cord Film Industries Fostex Framez Framus Frankenphone GEC Gardners Gaumont-Kalee Geloso Grampian Grundig Guitar HMV Hexapup In Action Kolster-Brandes LEM Lomo Lustraphone MB MOTM Marconi Marelli Meazzi Meico Melodium MicIRP Mount-a-Mic Oktava Philips Polyphon RCA RE20 RSA Reslo Reslosound Royer STC Selmer Sennheiser Shaftesbury Shure Siemens Sony Speiden Stellar T-bone Tannoy Telefunken Tesla Thiele Toshiba Vega Velotron Vox Ward Beck Webster Wetzel Workshop XLR Xaudia beyerdynamic cmv563 compressor condenser dynamic magnets meteor mic of the month mullard music box neumann patents pickup preamp re-made remade speaker syncron transformer tube mic unidentified unknown vintage zephyr