Used, tested and in good condition. The Aphex 230 Master Voice Channel Tube Mic Pre is an indispensable broadcast station tool. Youll find them in the production room, or installed as a permanent on-air feed-through for pumping up voices. The Aphex 230 also makes a powerful and easy-to-use channel for home and project studios with its reflected-plate amplifier tube mic preamp design plus compression, gating, de-esser, parametric EQ, aural exciter, and a bottom booster.