Mojave MA100 Stereo Set, two small diaphragm vacuum tube condenser mic´s with interchangeable cardioid and omnidirectional capsules. Design by David Royer. Allows use on high SPL instruments such as drums and guitar amps. Hand-selected 3-micron capsule, Jensen audio transformer, Military grade JAN 5840 vacuum tube, External switchable power supply voltage, Ultra clean signal path, Recommended applications: Acoustic Instruments, Drums, Guitar Amplifiers, Piano, Stereo Pairs (X/Y, MS, etc.), Decca Tree, Orchestral Recording, Choral Recording, Voice-overs and Broadcast, Percussion. FREQUENCY RESPONSE: 20 Hz - 20 kHz, ±3dB, SENSITIVITY: -37dB re 1V/pa, MAX. SPL: 120dB, DISTORTION: head amp only, not to exceed .4% @ 140 dB SPL, SELF NOISE: Not to exceed 16dB, IMPEDANCE: 450 ohms, POWER REQUIREMENTS: 100-120VAC; 220-240VAC, 50 or 60 Hz. Power consumption approx. 10 watts. Incl. carrying case, power supply for both mic´s, Mic clamps with Stereo Bar and cables.