NEUMANN KM 84 i NEUMANN KM 84 i Support/Tips & Hints/KM 84 i/NEUMANN KM 84i Clean ... NEUMANN KM 84i Cleaning Cardioid condenser microphone neumann.com Tips & Hints The needle ensuring the electronic connection between the capsule and the preamp tends, as time goes on, to unscrew by itself. It also tends to superficially oxidize, and requires from time to time a cleaning with an alcohol solution. / Write Review