Replacement compatibility This module can replace or upgrade common dual op amp stages in audio gear. It supports upgrading from devices such as LM833, LM4562, 4558, 5532, 4556, LF353, OP275, AD712, AD827, AD746, AD797, OPA2604, OPA627 to dual versions such as OPA633, and to dual variants like AD843 and AD847, among others. Sound and performance The sound is warm. The sound quality is delicate, soft and elegant, with highs and bold dynamics. Use with OPA627 OPA627 operational amplifier with field effect input mode is suitable for front end and rear end amplifiers, output buffers, voltage amplifiers, headphone amplifiers, and related stages. Appearance and build The assembly uses a plated adapter plate. The OPA627AU SMD op amp is paired with a fully plated, refined adapter plate. Applications - Upgrade a stereo preamplifier or power amplifier to improve linearity and channel balance. - Enhance headphone amplifier or output buffer stages for better drive and clarity. - Replace in front-end or input buffers of audio interfaces or active speakers for a cleaner signal path.