The Moonriver Model 404 Optional MM Phono Stage expands the amplifier’s vinyl playback capabilities with a dedicated moving magnet (MM) phono input module. Designed according to the same engineering principles as the Model 404 amplifier itself, the module uses quality components and a substantial power supply arrangement to deliver low-noise performance and accurate musical reproduction.

The module is designed for seamless integration within the Model 404, providing an elegant solution for vinyl enthusiasts seeking high-quality MM cartridge playback without the need for an external phono preamplifier.