|330,000 yen(March, 1997 release)
The control center which constituted the line amplifier part from a current
feedback magnification circuit, and was developed aiming at serious
consideration of a quality, and high-quality sound reproduction following
balance transmission technology.
adoption s The current feedback
(current feedback type) magnification circuit which returns an output signal in
the form of current is in the line amplifier part.
In this circuit, the
impedance of the input terminal which is a return side was lowered, current was
detected, I-V conversion of that current was carried out with the transformer
impedance amplifier, and the output signal is made. In this circuit, since the
impedance of a return input portion is very low, it is hard to generate phase
rotation and, as a result, there is almost no necessity for a phase guarantee.
For this reason, many characteristics have been sharply improved by a little
NFB, it excelled in dynamic characteristics, such as a standup, and the
natural energy response is realized.
The balance output circuit of a
bridge feedback system is adopted.
Balance transmission is a system which
sends simultaneously the positive/negative symmetrical signal which the phase
reversed mutually, and is excellent in the capability to remove the noise
ingredient in the common mode.
2 sets of amplifier, amp1 and amp2, is
prepared for balance transmission, and the symmetrical signal of +- is sent out
by low impedance C-265 as a relation of tucking up its sleeves with a cord which
feeds back each output to the other party. Since the feature of this circuit is
carried out [ floating of the symmetrical signal of +- ] from the ground, even
if it grounds one side of an output, both of amplifier operates and an Output
voltage does not change.
A line amplifier part is a pure complimentary
push pull circuit, and constitutes this from a discrete part by a current
feedback magnification circuit. The phase guarantee of each stage could be
offered light by this, and more natural sound quality has been obtained.
Moreover, the balance input amplifier which had a gain before volume was
placed, and S/N in the practical use region which extracted volume is improved
by arranging this line amplifier after volume.
C-265 consists of
right-and-left a total of six unit amplifier of balance input amplifier, line amplifier, and balance output amplifier. It fixed by thick aluminum extrusion
material so that a mutual intervention might not be carried out, and these unit
amplifier has prevented resonance by external vibration.
independence is used also with a power transformer and a filter capacitor, and
it has monophonic composition completely electrically.
The cross talk
between channels which passes a power-source part by this is stopped.
Furthermore, the mutual intervention between amplifier is prevented by
carrying a broadband power supply circuit for exclusive use in each unit
Since a straight signal course is constituted at the
shortest, the logic relay control system has been adopted.
The sealed type
relay for communication industry is adopted as the relay used for this, and
contacts are a plated with gold and a crossbar twin system, and have realized
low contact resistance and quantity durability.
The amplifier only for
headphone is formed and high-quality sound-ization is attained.
is possible to cut the output to power amplifier with an output on/off switch, and to carry out variable [ of the headphone output ] in main volume.
The added type active filter system is adopted as tone control.
this system, it passes straight, and if needed, an original flat signal is
another, and makes the characteristic, and the characteristic is adjusted with
making it adjust from a flat signal by it.
Two balance inputs are
The high-quality sound type using the small resistance object
of the distortion is adopted especially as volume. Volume control by a remote
commander is enabled by combining this volume controller and a small motor with
The rear panel is equipped with the slot which can extend the
option board corresponding to an AAB standard.
(The analog disc characteristic is the
characteristic at the time of input board AD-10 extension)
||Stereo control amplifier
AD input: 20Hz-20kHz±0.2dB
|Balanced, Unbalanced :
||3Hz-350kHz+0 -3.0 dB
power / 0.5V output)
|AD MM: 8.9mV/2.2mV/47kohm
0.25mV/0.063 mV/10ohm, 30ohm, a 100-ohm change
|An Output power/impedance
||Balanced, Unbalanced output:2V/50 ohm
Tape rec (at the time of AD input): 252mV/320 ohms
|S/N, input conversion noise
|At the time of an Output power
||Input conversion noise
(Distortion 0.005%, 20Hz - 20kHz)
|Balanced, Unbalanced output:6.0V
|Minimum load impedance
||Balanced, Unbalanced output: 600ohms
Tape rec: 10kohm
||Balanced, Unbalanced input -> Balanced,
Unbalanced output: 18dB
AD MM input -> Balanced, Unbalanced output: 47dB
AD MC input -> Balanced, Unbalanced output: 78dB
||Low-pitched sound (300Hz): ±10dB (50Hz)
Loud sound (3kHz): ±10dB (20kHz)
||+ 6dB (100Hz, Volume-30dB)
||Conformity impedance: 4ohms - 100ohms
|The maximum Dimensions
||Width 475x height 150x depth of 404mm
|Attachment: Remote commander RC-20
|Remote control system
||Infrared pulse system
||AA -- type (SUM-3/R6) and two pieces
|The maximum Dimensions
||Width 55x height 194x depth of 18mm
||100g (Battery included)
|Option: Option board
||Line-in board Line-10 (8,000yen)
|The common high-level input
terminal of an imbalanced system.
Analog signals, such as CD player and a
tuner, are played.
||Analog disc input board AD-10 (50,000yen)
|All cartridges are supported
by loading of a highly efficient high gain equalizer.
With an internal DIP
switch, a MM/MC change, MC input impedance, and Subsonic-Filter on/off can be
Input impedance: 47kohm
Input impedance: 10, a 30 or