The sound is warm, with a defined sound field. The sound quality is delicate, soft and graceful, with a high and strong tonal character. Appearance Exquisite adapter board with fully gold-plated pins. Includes a gold-plated OPA627AU SMD single operational amplifier. Compatibility and configuration You can use the usual dual op-amps in audio applications, including LM833, LM4562, 4558, 5532, 4556, LF353, OP275, AD712, AD827, AD746, AD797, OPA2604, and OPA627 for dual configurations. OPA637 can be used in dual. AD797 can be used in dual, AD843. Replace or upgrade to dual configurations, such as AD847 in a dual arrangement. Use cases OPA627 operational amplifier uses field effect tube input mode and is suitable for front and rear amplifiers, output buffers, voltage amplifiers, and headphone amplifiers. It is well suited for use as a front-end or output buffer in integrated audio paths, as a driver stage in headphone amplifiers, or as part of a voltage amplification stage in your audio circuitry.