This comprehensive service manual provides detailed technical information and step-by-step instructions for repairing the McIntosh MX-135 audio amplifier. It covers the chassis and electrical systems in depth, offering detailed wiring diagrams, technical diagnostic procedures, and disassembly and installation instructions. Numerous illustrations and schematics are included to guide you through every step of the repair process. You'll find the most complete service information available, originally designed for use by dealership technicians. This manual ensures you have the expert knowledge needed for effective and professional repair.

The McIntosh MX-135 is a legendary audio amplifier that stands as a testament to the enduring legacy of McIntosh, a company synonymous with high-fidelity sound reproduction. Released in the 1970s, the MX-135 embodies the classic McIntosh aesthetic: a sleek, brushed-aluminum chassis adorned with the iconic blue meters and the familiar McIntosh logo. This amplifier boasts an impressive power output, delivering 135 watts per channel into 8 ohms, a testament to its ability to drive even the most demanding speakers with authority. The MX-135 is renowned for its pristine sound quality, characterized by a rich, detailed midrange, a powerful and controlled bass response, and a sparkling treble that extends effortlessly into the upper frequencies. This combination results in a truly immersive listening experience, capable of bringing music to life with breathtaking realism. The MX-135's internal design is a masterpiece of engineering, featuring hand-wired circuitry and carefully selected components that contribute to its exceptional performance. The amplifier utilizes a sophisticated Darlington power output stage, renowned for its exceptional power handling capabilities and low distortion levels. The large, custom-wound transformers deliver ample power and ensure stable operation even under demanding conditions. The MX-135 is equipped with multiple input options, including a high-level input for direct connection to a preamplifier and a low-level input for use with tuners or other source devices. The amplifier also features a dedicated phono input, optimized for connecting a turntable and ensuring optimal performance for vinyl playback. The McIntosh MX-135, with its robust construction, meticulous engineering, and timeless design, is a true collector's item and a coveted piece of audio history. Its legendary performance and enduring sound quality continue to captivate audiophiles worldwide, proving that the MX-135 is a testament to McIntosh's unwavering dedication to delivering exceptional sound reproduction.