The G.R.A.S. ¼” preamplifier Type 26CB is ageneral-purpose preamplifier optimized for usewith prepolarized condenser microphones. It isa small, robust unit and uses a G.R.A.S. CCP¹power supply, e.g. Type 12AL. It has a very lowinherent noise level, a large dynamic range, anda frequency response from below 2 Hz to above200 kHz.