Working on building mixers based on other peoples' designs, he found that distortion – already visible in oscilloscope traces – and set out to eliminate it through better design. After a year of studying audio transistor circuitry and some experimentation, he decided to make his own amplifier equipment. His first professional audio product, launched in around 1970, was a small mixing desk – the M10.2. The first Naim Audio amplifier was sold in December 1971 – a power amplifier only made initially on demand for friends and acquaintances.