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