Accuphase AD-2850 Phono Stage Board

Name: Accuphase AD-2850 Phono Stage Board
Brand: Accuphase
SKU: ACCAD2850
Availability: InStock

Product variants

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.

Availability

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

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.

Who is this for?

The Accuphase AD-2850 Phono Stage Board is designed for vinyl enthusiasts who want to add a high-performance analogue input directly into a compatible Accuphase amplifier or preamplifier. It suits listeners who value simplicity and integration, while still demanding the refinement and musicality expected from a serious phono stage.

This option board is ideal for owners of high-quality turntables using moving magnet or moving coil cartridges who want a significant upgrade over entry-level or built-in phono stages. It delivers improved clarity, lower noise, and more natural tonal balance, helping vinyl playback sound more open, detailed, and engaging.

The AD-2850 is particularly well suited to compact or carefully curated HiFi systems in small to medium listening rooms, where keeping the signal path short and elegant is a priority. It allows vinyl to become a fully integrated part of a high-end system without adding extra components or complexity.