Variable pattern vacuum tube (valve) condenser microphone. 1.35” (34.5mm.) precision dual membrane capsule coupled through a minimalist tube circuit designed around the 12AY7 (6072) triode and a balanced transformer output. Pattern control is variable between omni directional, wide cardioid, cardioid, supercardioid, hypercardioid and figure of eight. In good condition. w/Power Supply, Case, Shockmount, and 2 leads.