Model a18p is stereo power amplifier. Massive toroidal transformer with independent secondary windings and a bank of eight 10,000uF electrolytic reservoir capacitors for each channel's main power supply. Both left and right channels are built as mono power amplifiers, each with seven pairs of high-current transistors mounted onto a thick copper bus bar. This is bolted onto the extruded heat sink that's visible on either side of the amplifier.

Combined with the advantage of class AB and the class A technology, the Cool Class A technology actually achieved the same linear sound performance but without the normal need of a big electrical current, as Class A does.