The Neuman NU67 is a high quality German studio microphone of 1970 vintage, which has come from the Macquarie University Speech Research Centre. It became obsolete in 1985 when the valves for it became difficult to obtain. It has one EF86 valve in the microphone proper and a separate power supply with a balanced line transformer unit. The microphone required a new valve every 6 months, or when the noise figure exceeded specifications. The microphone can be desk mounted or boom mounted. The sensitivity pattern can be switched to cardioid, figure 8, or omni directional. It has a web suspension to reduce any conducted noise. It was replaced by an transistorised AKG studio microphone which cost around $3000 in 1985.

microphone circuit
power supply circuit

Ray Robinson