Takamine CTP-3 is a preamplifier that enhances the sound of your acoustic guitar by adding warmth and clarity. With its 12AU7 vacuum tube, three-band EQ, and feedback-reducing notch filter, you can easily dial in your desired tone. Use the Aux In to blend in a second pickup or use the Aux EQ to shape the sound of your secondary pickup. The CTP-3 is powered by 4 AA batteries and features a standby switch to preserve battery life.