● AAVA volume control for high performance and outstanding sound● Separate high-efficiency toroidal power transformers for left and rightchannels ● 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

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 beenfurther refined, for ultra-low noise and utterly quiet operation, combined with perfect operation feel. Experience the ultimate involume 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.
‒ at the leading edge of technology
How AAVA works

AAVA operation principle is purely analog
The AAVA circuit converts the input music signal into 16 types ofweighted currents. According to the position of the volume control
knob, the currents are then combined to determine the volume. The
combined signal current forms a variable gain circuit that adjusts thelevel of the music signal.

Printed circuit boards made from glass fluorocarbon resin withlow dielectric constant and low loss, and gold-plated PCB copper
foil side
High-rigidity, high-accuracy volume sensor mechanism with ultrasmooth tactile feelTurning the volume knob on the front panel causes the actual volumelevel position to be detected. The corresponding combination of weighted
amplifiers then in turn adjusts the volume. The volume sensor
mechanism is made of a massive aluminum block extruded and finishedwith utmost precision. The knob provides an exquisite tactile feel whenrotated and ensures extremely accurate position detection. The entire
mechanism is supported by a floating suspension using insulators, which
also allows extremely quiet motor-driven operation when the remotecommander is used.

■ Remote commander RC-220
Allows volume adjustment,
input source switching, andother operations.

‒ simply aiming for the best
Full mono construction
Inside the preamplifier, circuits and components are securely
mounted to a sturdy 8 mm thick aluminum frame and kept
completely separate for the left and right channels. This reliably
prevents unwanted mutual interference, resulting in further improved
electrical characteristics and perfectly pure sonic performance.
Ideal left/right power supply configuration
The power supply circuitry not only acts as the energy source of anamplifier, it also has a dramatic influence on its sound. The C-2850
features a newly developed type of high-efficiency toroidal transformer ina cast-aluminum case with thermal dissipation fins. Each channel has its
own transformer, along with a pair of custom-made electrolytic filtering
capacitors rated for high capacity and excellent sonic properties. This
arrangement provides ample power reserves for effortless operation.

‒ convenience that makes sense
Total of 10 inputs and 5 outputs with text display
supportThanks to a versatile complement of input and outputs,
the C-2850 is ready for any program source combination.

Input indication examples
→
→
BAL
→
AD 1 (without AD-2850) →AD 1 (with AD-2850)→
AD 2 (with AD-2850)
→
TUNER
CD

On/off switching capability for input and level display
Phase selector for balanced connection
The PHASE button makes it easy to match the phase
configuration of any input or output component
connected via a balanced link.

Line level and balanced input and output connectors

12

3

45

Individual phase setting for each input
The phase can be set and memorized separately foreach input and recorder selector position.
Subsonic filter removes ultra low frequency noise
Three-stage loudness compensator offsets thecharacteristics of human hearing
3-stage gain selector
Overall gain can be set to 12 dB, 18 dB, or 24 dB.
Built-in dedicated headphone amplifier optimized forsound quality
EXT PRE function allows use of external preamplifier
Setting the OUTPUT selector to the EXT PRE
position allows the use of an external preamplifier orother component without having to change systemconnections.

67Sub panel 1 Output selector
5 Recorder selector

82 Gain selector
3 Loudness compensation selector 4 Headphone level selector
6 Phase selector button 7 Display on/off button
8 Subsonic filter

Phono Equalizer Unit

- Dedicated add-on

Analog records can be reproduced by installing the dedicated phonoequalizer unit 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. The
built-in differential RIAA equalizer circuit is designed to provide superaccurate RIAA equalization characteristics. The printed circuit boards
are made from glass cloth fluorocarbon resin and housed in a sturdy
aluminum enclosure to minimize any kind of external influence.
■ MC

Gain:
60/70 dB, switchable
Input impedance: 10/30/100/300 ohms (selectable)

■ MM

Gain:
30/40 dB, switchable
Input impedance: 47 kilohms■ Function setting controls on C-2850 front panel
AD-2850 installed

Phono equalizer employs dual mono construction to keep left andright channels separate

AD GAIN, MC/MMselector buttons＊For information regarding use in other preamplifiermodels (C-2820, C-2420 etc.), or regarding
compatibility with previous phono equalizer units(AD-2820 etc.), please contact your Accuphasedealer.

MC LOAD impedance selector buttons

Front panel

Input selector

Rear panel

Balance control

Loudness compensator selector
OFF / 1 / 2 / 3

Gain selector
12 dB / 18 dB / 24 dB

Headphone level selector
LOW / MID / HIGHLine input connectors
TUNER / CD / LINE 1,2,3

Level display

Input display
Indicators
OUTPUT / MONO /FILTER

Indicators
RECORDER /COMP / ATTPower switch Sub panel
Output selector
EXT PRE / ALL
BAL / LINE / OFF
Phase selector button
Mono / stereo selector button
Display on / off button
Subsonic filter button

Volume control

Line output connectors (2 sets)
External preamplifier input
connectors (Line)

Recorder playback /recording connectors

Phono equalizer unit
installation slot

Wood cabinet withnatural grain finish

Attenuator button
Headphone jackPressing this button opens thesub panel
Recorder selector
MC impedance selector buttons
MC / MM selector button
AD GAIN selector button

Balanced input connectors (2 sets)
CD-BAL / BAL★

AC power supplyconnector

Balanced output connectors (2 sets)

With line input signal: pin ② negative (–), pin ③ positive (+)
With balanced input signal: same phase as source equipment(Can be changed with phase selector button on front panel)

External preamplifier
input connectors(Balanced)

Guaranteed Specifications＊ Guaranteed specifications are measured according to EIA standard RS-490. AD: Analog Disc ＊ Specifications with AD-2850 installed. ＊ Gain selector set to 18 dB position.

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

Frequency Response BALANCED/LINE INPUT:

Total Harmonic Distortion (for all inputs)
Input Sensitivity,
Input Impedance

0.005%

Input sensitivity
Input impedance
For rated output For 0.5 V output
2.0 mV
8.0 mV47 kilohms
AD: MM/30 dB INPUT
0.63 mV
2.5 mV47 kilohms
AD: MM/40 dB INPUT
0.063 mV 10/30/100/300 ohms, switchable
AD: MC/60 dB INPUT 0.25 mV
0.02 mV 10/30/100/300 ohms, switchable
AD: MC/70 dB INPUT 0.08 mV
63 mV 40 kilohms/20 kilohms
252 mVBALANCED/LINE
Input

Rated Output Voltage, BALANCED/LINE OUTPUT
Output Impedance
S/N Ratio

RECORDER REC (with AD input)

2V

50 ohms

252 mV

200 ohms

Input shorted (A weighting)
S/N ratio at rated output
94 dB
AD: MM/30 dB INPUT
85 dB
AD: MM/40 dB INPUT80 dB
AD: MC/60 dB INPUT
73 dB
AD: MC/70 dB INPUT
111 dBBALANCED/LINE
Input

Maximum Output Level (0.005% THD, 20 ‒ 20,000 Hz)
BALANCED/LINE OUTPUT:
RECORDER REC (with AD input):

EIA S/N
86 dB
86 dB
86 dB
87 dB
110 dB

7.0 V
6.0 V

Maximum Line Input Voltage BALANCED/LINE INPUT:

6.0 V

Maximum AD Input Voltage MM [30/40 dB] INPUT:(1 kHz, 0.005% THD) MC [60/70 dB] INPUT:

310/96.5 mV
9.5/3.2 mV

Minimum Load Impedance BALANCED/LINE OUTPUT:
RECORDER REC:

600 ohms
10 kilohms

Gain (18 dB position)

Gain selector
switch:12/18/24 dB
switchable

BALANCED/LINE INPUT → BALANCED/LINE OUTPUT:
LINE INPUT→ LINE OUTPUT:
AD [MM: 30/40 dB] INPUT → BALANCED/LINE OUTPUT:
AD [MM: 30/40 dB] INPUT → REC OUTPUT:
AD [MC: 60/70 dB] INPUT → BALANCED/LINE OUTPUT:
AD [MC: 60/70 dB] INPUT → REC OUTPUT:

18 dB
18 dB
48/58 dB
30/40 dB
78/88 dB
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

Subsonic Filter

10 Hz: –18 dB/octave

Attenuator–20 dB

Gain (LOW, MID, HIGH): ±10 dB from standard MID level

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

Remarks★ This product is available in versions for 120/220/230 V AC. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
★ The 230 V version has an Eco Mode that switches power off after 120 minutes of inactivity.
★ The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.

Supplied accessory● AC power cord
● Audio cable with plugs ASL-10● Remote commander RC-220● Cleaning cloth●The specifications and appearance of this product are subject to change without notice.

5年間保証

F1605Y PRINTED IN JAPAN 850-2196-00（B1）