Audio Database

The

Accuphase C-202
215,000 yen(January, 1987 release)

Description

The stereo preamplifier which made the amplifier only for CD which pursued sound quality other than the usual line amplifier to the limit build in, and raised the purity of sound thoroughly.

In order to play CD by the quality of a limit, the buffer amplifier only for CD is built in apart from the usual line amplifier.
The amplifier only for CD consists of balance circuits of the whole page Class-A push pull, and a signal enters direct from an input terminal and is also carrying out the function to the necessary minimum function of volume control and an Attenuator. Thereby, it is simplified and the signal course is aiming at realization of the detail and the stereophonic acoustic field.
Moreover, the amplifier only for a line prepares for many inputs at the same time it consists of whole page Class-A push pulls and performs high magnification of purity, and it carries the function required as a preamplifier.

Only an Attenuator of -20dB and the volume for volume control are carried in the signal course of CD.
Moreover, it has the balance input-and-output terminal, and ideal balanced transmission is attained by connecting power amplifier with CD player with a balance output.
The balance input amplifier only for CD inputs a balance signal into the differential push pull circuit of an input, and the cold (-) side is connected to a ground with the switch of a rear surface panel at the time of the usual imbalanced input.
The buffer of an input has improved the linearity of an input by dregs cord connection, and has prevented clipping at the time of the Dainyuu power. Moreover, the dregs cord push pull drive stage supplied few distorted drive signals to the output stage, and realized low distortion and an extensive dynamic range, and zone outside has improved the characteristic of a super-high region especially.
In addition, since it becomes the shortage of a profit depending on power amplifier, a profit of 6dB is given.

The line amplifier system carries recording / playback functions, such as a tape monitor and a tape copy switch, -20dB Attenuator, a mode switch, a Compensation, a Subsonic Filter, balance control, etc.
Line unit amplifier has fundamentally the form where it connected cold one of the input to the ground, with the same composition as the amplifier only for only for CD.

In order to avoid taking about a signal course for functions, such as an input change and a tape monitor, the logic relay control by relay is adopted.
The encapsulated type relay developed as an object for audios is adopted especially as a relay, and a contact is a crossbar twin system and has become low contact resistance and a thing of high durability which has high quality.

The power-source part constitutes the rectifier circuit for exclusive use supplied with the transformer winding wire only for a right-and-left channel. Moreover, the filter capacitor has obtained the direct-current voltage in which 10,000 micro F is good at four pieces.
Furthermore, in order to use a pure and powerful power source, the multiple power supply system which prepares a constant-voltage power source in each of each unit amplifier is adopted, and power-source impedance is kept low by a constant-voltage power source being arranged in the near position of unit amplifier.

The sideboard of the natural persimmon is attached to both sides.


Rear
Internal Circuit

Rating of a mode
Form Stereo preamplifier
<CD system>
Frequency response 1.0Hz-400,000Hz+0 -3.0 dB
20Hz-20,000Hz+0 -0.2 dB
THD 0.005%
Input sensitivity/impedance Balanced input: 1.0V/40kohm
Unbalanced input: 1.0V/20kohm
An Output power/impedance A balanced output: 4.0V/50 ohm
Disequilibrium output: 2.0V/1 ohm
Headphone jack Conformity impedance: 4ohms - 100ohms
Profit Balanced-input -> balance output: 12dB
Balanced-input -> disequilibrium output: 6dB
Unbalanced-input -> balance output: 12dB
Unbalanced-input -> disequilibrium output: 6dB
The signal to noise ratio and input conversion noise At the time of a rated input (input short-circuit and A-compensation): 108dB
Input conversion noise (input short-circuit and A-compensation): -108dBV
EIA S/N:97dB
Maximum-except-take-off level A balanced output: 10V
Disequilibrium output: 5V
Maximum input level Balanced input: 10V
Unbalanced input: 8V
Minimum load impedance A balanced output: 600ohms
Disequilibrium output: 1kohm
Tape Rec: 10kohm
Attenuator -20dB
<Line system>
Frequency response 1.0Hz-500,000Hz+0 -3.0 dB
20Hz-20,000Hz+0 -0.2 dB
THD 0.0055%
Input sensitivity/impedance 200mV/20kohm
An Output power/impedance A balanced output: 4.0V/50 ohm
Disequilibrium output: 2.0V/1 ohm
Headphone jack Conformity impedance: 4ohms - 100ohms
Profit A balanced output: 26dB
Disequilibrium output: 20dB
The signal to noise ratio and input conversion noise At the time of a rated input (input short-circuit, A-compensation): 110dB
Input conversion noise (input short-circuit, A-compensation): -128dBV
EIA S/N:94dB
Maximum-except-take-off level A balanced output: 10V
Disequilibrium output: 5V
Minimum load impedance A balanced output: 600ohms
Disequilibrium output: 1kohm
Tape Rec: 10kohm
Attenuator -20dB
Loudness Compensation
(Volume control-30dB)
1:+3dB(100Hz)
2: +8dB (100Hz), +6dB (20kHz)
Subsonic Filter 10Hz, -12 dB/oct
<Synthesis>
The semiconductor used Transistor: 110 pieces
FET: 54 pieces
IC: 12 pieces
Diode: 79 pieces
Power source AC100V/117V/220V/240V, 50Hz/60Hz
Power consumption 40W
Dimensions Width 475x height 135x depth of 373mm
Weight 11kg