C-2850 Stereo Preamplifier
C-2850 Stereo Preamplifier
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C-2850 Stereo Preamplifier

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Accuphase

C-2850 Stereo Preamplifier

C-2800 series renewal creates the ultimate preamplifier — C-2850. A new preamp generation defined by the harmony of craftsmanship and technology. The revolutionary AAVA (Accuphase Analog Vari-gain Amplifier) principle which enables optimal volume adjustment has been further refined, for ultra-low noise and utterly quiet operation, combined with perfect operation feel. Experience the ultimate in volume control performance and comfort from a component that is in a class of its own. Sophisticated technology and optimized construction using only carefully selected top-notch parts and materials provide effortless operation stability, with ample performance leeway that is the secret behind ultimate reliability. Each single C-2850 is lovingly built by highly experienced craftspersons skilled in the art. The result is a product destined to transport the listener into the enchanting realm of high-end audio.

  • AAVA volume control for high performance and outstanding sound
  • Separate high-efficiency toroidal power transformers for left and right channels
  • Selectable preamp gain
  • Fully modular construction with separate left/right units for each amplifier stage
  • Logic-controlled relays for shortest signal paths
  • Independent phase selection for each input position
  • Printed circuit boards made from glass cloth fluorocarbon resin
  • Optional playback capability for analog records
  • Massive wood cabinet with natural grain finish

 

 

 


Frequency Response


BALANCED/LINE INPUT

3 ‒ 200,000 Hz +0 -3.0 dB 20 ‒ 20,000 Hz +0 -0.2 dB

AD INPUT [MM/40 dB, MC]
 
20 ‒ 20,000 Hz ±0.2 dB

AD INPUT [MM/30 dB]:

20 ‒ 20,000 Hz ±0.3 dB


Total Harmonic Distortion (for all inputs)

0.005%

Input Sensitivity, Input Impedance

Input
 
Input sensitivity

For rated output
 
For 0.5 V 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 kilohms/20 kilohms

Rated Output Voltage,


Output Impedance


BALANCED/LINE OUTPUT
 
2 V 50 ohms

RECORDER REC (with AD input)

252 mV 200 ohms
 
S/N Ratio

Input
 
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 

Maximum Output Level (0.005% THD, 20 ‒ 20,000 Hz)

BALANCED/LINE OUTPUT: 7.0 V
 
RECORDER REC (with AD input): 6.0 V 

Maximum Line Input Voltage

BALANCED/LINE INPUT: 6.0 V

Maximum AD Input Voltage


(1 kHz, 0.005% THD)


MM [30/40 dB] INPUT:

310/96.5 mV

MC [60/70 dB] INPUT:
 
9.5/3.2 mV

Minimum Load Impedance

BALANCED/LINE OUTPUT:
 
600 ohms

RECORDER REC

10 kilohms

Gain (18 dB position)


Gain selector switch: 12/18/24 dB switchable


BALANCED/LINE INPUT → BALANCED/LINE OUTPUT: 18 dB

LINE INPUT → LINE OUTPUT: 18 dB
 
AD [MM: 30/40 dB] INPUT → BALANCED/LINE OUTPUT: 48/58 dB

AD [MM: 30/40 dB] INPUT → REC OUTPUT: 30/40 dB

AD [MC: 60/70 dB] INPUT → BALANCED/LINE OUTPUT: 78/88 dB

AD [MC: 60/70 dB] INPUT → REC OUTPUT: 60/70 dB

Loudness Compensation

1: +2 dB (100 Hz), 2: +4 dB (100 Hz), 3: +6.5 dB (100 Hz)

Headphone Jack

Output level: 2 V (40 ohms), Suitable impedance: 8 ohms or above Gain (LOW, MID, HIGH): ±10 dB from standard MID level

Subsonic Filter

 10 Hz: –18 dB/octave

Attenuator

–20 dB

Power Requirements

AC120 V/220 V/230 V 50/60 Hz (Voltage as indicated on rear panel)

Power Consumption

40 watts

Maximum Dimensions

Width 477 mm (18-3/4") Height 156 mm (6-1/8") Depth 412 mm (16-1/4") (Depth 414 mm with AD-2850 installed)

Mass

24.5 kg (54.0 lbs) net (25.4 kg (56.0 lbs) with AD-2850 installed) 31.0 kg (68.3 lbs) in shipping carton

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