Accuphase C-2810 (2006)

Name: Accuphase C-2810
Brand: Accuphase

Precision preamplifier released in June 2006 with fully mono-construction and AAVA volume control.

Overview

The Accuphase C-2810 is a high-end stereo preamplifier made by Accuphase Laboratory Inc. and released in June 2006. It was sold as the "Precision Preamplifier C-2810." The construction is fully mono, with separate power transformers and circuitry for the left and right channels. It has an EXT PRE function for use with an external preamplifier. Phase settings can be stored for all inputs. It supports recording and playback between two recorders, with mutual copying. There is a built-in high-quality headphone amplifier, and a wireless remote handles volume and input selection. The AD-2800 phono equalizer unit is a separately sold option and connects through a DIN standard connector.

Specifications

Product Type	Preamplifier
Release Year	2006
Original Price	¥1,150,000
Weight	21.6 kg
Dimensions (W×H×D)	477 × 156 × 412 mm
Power Consumption	43W
Power Supply	100 VAC, 50Hz/60Hz
Total Harmonic Distortion	0.005%
Frequency Response (Balanced/Unbalanced)	3 Hz – 200 kHz (+0, -3.0 dB), 20 Hz – 20 kHz (+0, -0.2 dB)
Maximum Output Level (Balanced/Unbalanced)	7.0 V
Rated Output (Balanced/Unbalanced)	2 V / 50 Ω
Minimum Load Impedance (Balanced/Unbalanced)	600 Ω
Signal-to-Noise Ratio (Balanced/Unbalanced)	111 dB / 110 dB (A-weighted)
Input Conversion Noise (Balanced/Unbalanced)	-123 dBV
Gain (Balanced Input → Output)	18 dB (switchable)
Attenuator	-20 dB
Subsonic Filter	10 Hz, -18 dB/octave
Compensator Settings	1: +3 dB (100 Hz), 2: +8 dB (100 Hz), +6 dB (20 kHz)

Design

The C-2810 uses AAVA (Accuphase Analog Vari-gain Amplifier) volume control. It is made up of 16 weighted V-I conversion amplifiers and a current switch, and CPU-controlled electronic switching gives 65,536 precise volume steps. The circuitry is fully mono, with independent R-toroidal transformers on the left and right sides. Each one is encased in a three-layer structure of glass fiber core, strong resin, and epoxy filler. Logic relays handle input/output switching, and the PCBs are Teflon substrate with gold-plated copper foil, which keeps the signal path clean. The optional AD-2800 phono stage uses the same Teflon-based board and sits in an aluminum case. The internal assemblies are Balance Input Amp, Recording Amp, VI(2), VI(4), Filter Amp, Mother Board, IO Relay, Daughter Board, Connector Board, Volume, Power Switch, and Input Selector units. Key parts include transistors 2SC3902-S/T and 2SA1507-S/T, IC UPC4570G2, and precision capacitors and resistors in polypropylene, PPS, ceramic, and electrolytic types.

Market

The Accuphase C-2810 was originally priced at ¥1,150,000 at release in 2006. With the optional AD-2800 phono stage fitted, total weight goes up to 22.5 kg and depth extends to 414 mm.