conrad-johnson ET3 Line Stage Vacuum-Tube Preamplifier with Remote Gain: 25 dB. Maximum Output: 20 Vrms. Distortion: less than .15% THD Impedance: 100 Ohms. Freq. Response: 2 Hz to more than 100 KHz. Hum and Noise: 98 dB below 2.5 V Tube Compliment: 1x 6922. Phase: phase inverting. Dimensions: 13.125D x 19W x 3.315H inches Made-in-USA