M-2

About the M-2

The Yamaha M-2 is a vintage stereo power amplifier produced between 1979 and 1982, renowned for its robust build and audiophile performance. It features a striking black metal case with dual LED peak level meters (20 segments per channel), illuminated switches for power and speaker selectors (A/B), protection indicators, and gold-plated RCA inputs and speaker outputs. Designed with three parallel-connected Toshiba 2SC2461/2SA1051 transistors per channel in a triple push-pull output stage, it ensures linearity and low distortion. The power supply includes a large toroidal transformer and 44,000µF capacitance per channel with regulated supplies. Additional features include Linear Transfer bias switching, pure copper 2.5mm bussing, phase-corrected polystyrene capacitors, ground termination, and AC+DC input options. It runs hot, requiring good ventilation, and benefits from periodic bias/DC offset adjustments. Recent sales indicate values around $1000-$1250 for serviced units.