The Accuphase AD-2850 phono stage board is a high-performance component designed to extract the maximum detail and musicality from your vinyl records. This board is ideal for those who demand the highest levels of phono reproduction.Featuring premium components, the AD-2850 offers exceptional signal-to-noise ratio and low distortion. The board's adjustable MC/MM input impedance and gain settings allow it to be easily matched to a wide range of phono cartridges.The AD-2850 uses printed circuit boards made from glass cloth fluorocarbon resin, housed in a sturdy aluminium enclosure to minimise any kind of external influence. The input terminals are connected to the amplification circuitry by the shortest possible route, realising outstanding signal/noise ratio. The use of a DIN standard connector for the link to the host component provides enhanced reliability.Features Differential amplifier circuit with ultra low noise bipolar-transistors for MC cartridges. Differential amplifier circuit with ultra low noise junction-FET for MM cartridges. Differential RIAA equalizer circuit is designed to provide super accurate RIAA equalization characteristics. MC Load settings are selectable from among 4 values “10Ω/30Ω/100Ω/300Ω”. The input impedance for both MM settings is 47kΩ. Storing separate MC Load and/or AD GAIN settings for each installed AD input (AD1 and/or AD2) is available, and it enables the smooth switching of 2 kinds of analog players or tone arms. The printed circuits are made from glass cloth fluorocarbon resin. Specifications MM/40dB, MC: 20～20,000Hz ±0.2dB MM/30dB: 20～20,000Hz ±0.3dB AD maximum input voltage (1 kHz, 0.005% THD) MM/30dB INPUT: 310mV MM/40dB INPUT: 96.5mV MC/60dB INPUT: 9.5mV MC/70dB INPUT: 3.2mV Gain (Gain selector set to 18 dB position, 12/18/24 dB settings available) AD[MM:30/40dB]INPUT → BALANCED/LINE OUTPUT: 48/58dB AD[MM:30/40dB]INPUT → REC OUTPUT: 30/40dB AD[MC:60/70dB]INPUT → BALANCED/LINE OUTPUT: 78/88dB AD[MC:60/70dB]INPUT → REC OUTPUT: 60/70dB Input sensitivity and impedance Input, Input Sensitivity (For Rated Output/For 0.5V Output), Input Impedance AD-MM/30 dB INPUT, 8.0 mV, 2.0 mV, 47 kilohms AD-MM/40 dB INPUT, 2.5 mV, 0.63 mV, 47 kilohms AD-MC/60 dB INPUT, 0.25 mV, 0.063 mV, 10/30/100/300 ohms, switchable AD-MC/70 dB INPUT, 0.08 mV, 0.02 mV, 10/30/100/300 ohms, switchable BALANCED/LINE, 252 mV, 63 mV, 40/20 kilohms, switchable Signal-to-Noise RatioInput, Input shorted (A weighting) S/N ratio at rated output, EIA S/N AD-MM/30 dB INPUT, 94 dB, 86 dB AD-MM/40 dB INPUT, 85 dB, 86 dB AD-MC/60 dB INPUT, 80 dB, 86 dB AD-MC/70 dB INPUT, 73 dB, 87 dB BALANCED/LINE, 111 dB, 110 dB
