The OPA1612 (dual) bipolar- input operational amplifiers achieve very low 1.1-nV/√Hz noise density with an ultra low distortion of 0.000015% at 1 kHz. The OPA1611 and OPA1612 offer rail-to-rail output swing to within 600 mV with a 2-kΩ load, which increases headroom and maximizes dynamic range. These devices also have a high output drive capability of ±30 mA.
Other Ultra-low distortion amplifiers and more audiophile stuff you can find here - kaltecs.com
Please note that the operational amplifiers are available in two different pin cross-sections options - circular (0.5mm diameter) and rectangular (0.65x0.68mm). Let me know which one you prefer.
For complete customer satisfaction, before shipping, all op amps are tested for full functionality.
1 Features
1• Superior Sound Quality
Ultralow Noise: 1.1 nV/√Hz at 1 kHz
Ultralow Distortion: 0.000015% at 1 kHz
High Slew Rate: 27 V/μs
Wide Bandwidth: 40 MHz (G = +1)
High Open-Loop Gain: 130 dB
Unity Gain Stable
Low Quiescent Current: 3.6 mA per Channel
Rail-to-Rail Output
Wide Supply Range: ±2.25 V to ±18 V
2 Applications
Professional Audio Equipment
Microphone Preamplifiers
Analog and Digital Mixing Consoles
Broadcast Studio Equipment
Audio Test And Measurement
High-End A/V Receivers