AD-50

About the AD-50

The Accuphase AD-50 is a dedicated internal phono stage board that can be installed in various Accuphase preamplifiers or integrated amplifiers. It features the latest circuit topology and high-quality components to achieve ultra-low noise and precise RIAA equalization with minimal deviation, faithfully reproducing the sonic character of analog records. It supports both Moving Coil (MC) and Moving Magnet (MM) cartridges with front panel switching. For MC cartridges, input impedance is selectable among 30, 100, or 300 ohms to match the cartridge, while MM input impedance is fixed at 47 kilohms. The gain is 66 dB for MC and 40 dB for MM. A subsonic filter at 25 Hz (-12 dB/octave) reduces ultra-low frequency noise and record warp effects. The AD-50 is the fifth generation of Accuphase's analog disc input boards, offering improved noise performance over previous models and wide backward compatibility with many Accuphase amplifiers. Internal DIP switches control MC input impedance and subsonic filter on/off. This phono stage board is highly regarded for its low noise, precise equalization, and flexibility for various cartridge types.