Product Details
AD-2850 is the dedicated phono equalizer unit. Analog records can be reproduced with high quality by installing AD-2850 in a rear-panel slot. The AD-2850 features separate input circuitry for MC and MM cartridges to ensure optimum matching and realize outstanding S/N ratio. 2 sets of analog-player input jacks, the AD1 and AD2 are equipped, and their selections are switchable with the INPUT selector of pre-amplifiers.
Product Specifications:
- 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.
Guaranteed Specifications [Guaranteed specifications are measured according to EIA standard RS-490] (Specifications installed in C-2850)
Frequency Response
MM/40dB, MC :20~20,000Hz ±0.2dB
MM/30dB :20~20,000Hz ±0.3dB
AD Maximum input voltage (1kHz, 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 | Input Impedance | |
For Rated Output | For 0.5V Output | ||
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 Ratio
Input | Input shorted (A weighting) | EIA S/N |
S/N ratio at rated output | ||
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 |
AD-2850 circuit diagram (one channel)

Compatibility
Compatibility with other pre-amplifiers (C-2820/C-2420 etc)