|395,000 yen(September, 1978 release)
Stereo control amplifier planned as an object for highest-class audio systems.
A panel layout is the individual thing which used the push switch
extensively, and circuit composition constituted all the magnification stage
symmetrical type push pull drives from a Class-A direct-current system, and
supplies the highest-class thing also to the element which affects sound
The panel face consists of four rotation knobs, one lever
switch, and 57 push switches.
By electronic control, especially an input
selector is a system which controls the relay in a circuit, and can be changed
by feather touch.
The change of head amplifier uses the strong point of an
electronic-control system, and according to the cartridge of DISC1 and DISC2, it
is possible to make ON/OFF memorize for exclusive use, respectively, and it is
Moreover, in order to improve the push switch and relay
contact resistance which influence sound quality and durability, all are
considered as the composition of 2 circuit arrangement use.
To an output, the perfect symmetrical type push pull circuit is adopted
as all the magnification stages of the amplifier only for headphone from
the entrance of head amplifier. This circuit was excellent in the linearity
and has obtained the distortion best by a little NFB. As a result, TIM
distortion which is a factor of sound quality degradation is improved.
unit amplifier of all of head amplifier, equalizer amplifier, high-level
amplifier, and headphone amplifier is made into direct-current system. The
capacitor for direct-current cut of NF loop which needs large scale is removed, and also an input capacitor is removed, it has become an ICL system, and sound
quality is improved.
With input differential push pull composition, RET
(ring emitter transistor) specially developed as an object for small signals is
adopted, and head amplifier contributes to improvement in sound quality.
Furthermore, input conversion noise is low suppressed by making an Output load
impedance low by the large current drive of an output stage, and setting up
return partial-pressure resistance low.
Moreover, head amplifier is
modularized, does not have this evening of humidity, either, and carries out
stable operation also to a temperature change.
As for equalizer
amplifier, all the future magnification stages consist of symmetrical type push
pulls through the FET buffer of an input.
The output of the equalizer
adopted RET for high frequency electric power magnification (ring emitter
transistor), by Class-A large current drive, measured low
Output-load-impedance-ization and has set up return partial-pressure resistance
low. The input conversion noise level near ideal full limits has been obtained
by using high gmFET for an input buffer simultaneously.
amplifier (flat amplifier), direct-current servo system (PAT, PEND) is adopted
so that it may operate as direct-current amplifier also in the state where tone
control is used, and direct-current drift is suppressed to the almost nil state.
It becomes unnecessary [ an output condenser ] with direct-current servo
system, and there is no condenser for a direct-current cut from Tuner and an AUX
terminal to an output.
The headphone amplifier which used the pure complimentary circuit is carried
in the amplifier only for headphone.
What constituted the slide child on 18 brushes is adopted as volume, and
conductive plastic elements of specular surface finishing are consisted
of by the resistance object.
It is what
really carried out the mall degree of the film-like resistance object which
arranged conductor nature particles continuously to the insulator of
thermosetting resin, and the surface forms the smooth and strong emulsion side.
Contact resistance serves as stable volume over 1/18, and and the long
period of time to pull theoretically by adoption of 18 slide children and
a conductive plastic element.
An electromagnetism type cartridge serves as
resonance of a vibration system, an inductance of a coil, and the characteristic
that the peak produced in the quantity region for the wiring tray capacity etc.
Since the high region characteristic of such a cartridge is adjusted, high
frequency trimming can be carried and it can carry out variable [ of between
-8dB ] continuously at 20kHz from a flat state.
It is DISC1 and DISC2 exclusive
use and can control according to each cartridge.
When 500Hz, 200Hz, and
loud sound use a turnover (200Hz and 7kHz) at 2kHz and 7kHz in low-pitched
sound, control of heavy low-pitched sound and the highest region is possible for
the turnover change of tone control. A change is a step type of 2dB.
Hearing impression at the time of small volume is rectified, and the
loudness Compensation switch which prepares energy balance is carried.
kinds of curves can be chosen according to the characteristic of a regeneration
level or a listening room.
The practicality of a filter is thought as
important and only the Subsonic Filter of 17Hz and 12dB is carried.
added to the input element of high-level amplifier, and the active filter is
In order not to add an active device for exclusive use, sound
quality degradation does not occur, either.
Two-set connection is
possible for a tape recorder, and mutual dubbing is possible for it, hearing
other program sauce by independent Koppies Izzi.
Moreover, when cutting an
unnecessary program, the ON-OFF switch of the convenient recording output is
At the time of OFF, this switch has an effective power source of a
tape recorder, also in order to prevent distortion generated since an input
circuit becomes the load of a control center.
The Attenuator switch is carried in the time of discovering the start point
of a record and a record chipping, and changing. The switch which changes
a level is formed besides this and three kinds of -10dB attenuation levels
of -20dB-30dB can be chosen.
The mode switch has prepared the Blend position other than Stereo, Rev, and Mono.
It is for using it, when the interval of a speaker is too large,
or when reproducing the sauce which reproduces the program sauce which carries
out a separation unnaturally, and a spread of right and left narrows in 10dB, and turns into a natural spread.
The canon output connector is carried
in one of three outputs.
It is stored by the cabinet of the native wood
||Stereo control center
||High-level input: It is +0 20Hz - 20000Hz.
Disc input: 20Hz-20000Hz}0.2dB
||0.005% (for 20Hz - 20kHz, Output power)
|Input sensitivity/input impedance
||DISC1, 2 (Head Amp OFF):2.0mV/100 ohm,
47kohm, 82kohm, a 150kohm change
DISC1, 2 (Head Amp ON):0.1mV/100ohm
Tuner, AUX, Tape Play1, 2:126mV/50kohm
|An Output power/Output load impedance
(Volume maximum, the rated input)
|Output: 2.0V/2 ohm
||Output load impedance: 0.3ohm
(8ohm load): 0.25W, 1kHz, 0.01% of distortion
|Maximum-except-take-off level (for 20Hz -
||More than 10V, 0.005% of distortion
|The disc maximum input
||Head Amp OFF: 400mVrms, 1kHz, 0.005% of
Head Amp ON: 20mVrms, 1kHz, 0.005% of distortion
|Minimum load impedance
Tape Rec: 10kohm
(It is +26dB at the time of the DISC input HEAD AMP ON)
|Tuner, AUX, and Tape Play
|DISC (Head Amp OFF)
|S/N / Input conversion noise
time of input short-circuit, IHF-A, and a rated input)
|High-level input: 110dB / -128dBV
input (Head Amp OFF): 85dB / -139dBV
Disc input (Head Amp ON): 72dB /
||The change type by 8 step push switch
||500Hz : }8dB (50Hz)
||2kHz : }8dB (20kHz)
COMP of 3:+10dB (50Hz), +6dB (20kHz)
(with Volume control and -30dB)
|Disc height rimming
||DISC1, DISC2, 0dB - -8dB continuation
variable (with 20kHz)
||- A 10dB -20dB-30dB change type
||17Hz, 12 dB/oct
|The semiconductor used
||159Tr, 10FET, 102Di
||100V, 117V, 220V, 240V, 50/60Hz
||Width 466x height 188x depth of 391mm