C-280L

About the C-280L

The Accuphase C-280L is a stereo preamplifier introduced in February 1987, designed with two balanced line amplifiers and ten input terminals. It employs a balanced transmission line amplifier with separate amplifiers for hot and cold sides, utilizing a complementary service differential push-pull amplifier circuit for each. Volume control is achieved via a precision 4-channel volume system fully separated for hot and cold signals. The amplifier stages use Class A push-pull configuration with cascode design and FET loads to minimize base current leakage and reduce coloration in sound reproduction. A DC servo system prevents DC drift, allowing direct coupling from MC input to output. The unit features a robust mechanical design with a thick aluminum housing for heat dissipation and vibration prevention. Power supply is dual mono with dedicated transformers and multiple constant voltage power supplies for low impedance and high stability. Signal paths use electronically controlled relays for switching to maintain signal purity. Additional features include a monitor switch for tape recorders, a low-range volume compensator, and a subsonic filter. The C-280L is renowned for superb clarity, tonal richness, a large soundstage, and detailed balanced performance, making it an end-game preamplifier for many audiophiles. It was originally