|98,000yen(around the 1981 time)
The Integrated Amplifier which supplied original technology, such as amplifier
unreturned [ of 0dB ], a direct A system, a super equalizer, and was developed.
MC input terminal to the speaker output terminal considered it as the
whole page Capacitor-Less (perfect direct-current composition) which uses not a
capacitor for the main signal course, and has formed the signal course into pure
& high speed thoroughly.
This perfect Capacitor-Less composition
suppressed direct-current drift by adopting the direct direct-current servo
circuit carried in PMA-970 or PMA-950, and has secured super-low-pass stability.
The MC/MM super equalizer is carried and the outstanding RIAA deflection
characteristic of 20Hz-100kHz}0.2dB exceeding the high region play threshold
frequency of a high-class cartridge is acquired.
Composition consists of the
NF form direct-current amplifier and CR form equalizing filter by newly
developed low noise dual FET, and the first rank has composition of the parallel
differential amplification by dual FET of a direct direct-current servo system.
The amplifier unreturned [ of 0dB ] is adopted as a power amplifier
The amplifier unreturned [ of 0dB ] takes out ingredients (distortion,
noise, etc.) other than an incoming signal for the signals (main signal +
distorted ingredient etc.) acquired from the output side of the main amplifier
in a direct distortion servo circuit as compared with an incoming signal.
This distorted ingredient is amplified in a direct distortion servo circuit, and also phase inversion is carried out, and it is added to the input side of
the main amplifier. By this, a distorted ingredient is negated and static
distortion is suppressed.
Furthermore, with the amplifier unreturned [ of 0dB ], since [ through
which a signal flows only into one way ] a direct-pass, dynamic distortion
does not occur. Moreover, noise ingredients other than static distortion
are also cancellable as a difference of an incoming signal by the effect
of a direct distortion servo circuit. Furthermore, the buffer (emitter-follower)
which separates a voltage magnification stage and an electric power magnification
stage is designed, and in order that there may moreover be no NFB loop,
a voltage magnification stage is not influenced by a speaker. Furthermore,
since the excessive amplification degree by NFB is not needed, it has the
various features -- an intermediary coarse magnification stage can constitute
Circuit composition of the power amplifier part was used as the 3 steps
of differential current mirror by first rank low noise FET, by the complimentary
emitter-follower, attained low impedance-ization and has separated it completely
with the electric power magnification stage.
Moreover, an electric power
magnification stage is used as the output stage of a high-speed power transistor
2 parallel push pull, from the output terminal, it applies a direct
direct-current servo to the first rank of a voltage amplifier at overalls,
suppresses direct-current drift, and is attaining super-low-pass stabilization.
Furthermore, the zero crossing linear bias circuit of DENON original is
adopted as an output stage, and generating of the switching distortion by cutoff
of a power transistor is canceled.
In order to reduce the distortion at
the time of speaker real load, the real drive circuit is carried.
In a real drive circuit, the real drive line by an electronic device is
set up, and it writes with an A.S.O. (Area of Safety Operating: safe operation
domain) line and the protection line approached extremely,Even if a speaker
load operation line becomes large at the time of the Oide power, a protection
line is not contacted but the thing of the engine performance of a transistor
done for a high power drive up until last minute is possible.
This is reducing
the distortion at the time of speaker real load to 50 by about 1/.
The aluminum radiator was made to separate equalizer amplifier and power amplifier, and the mutual intervention is eliminated.
Moreover, the input change is
attaining shortening of wiring as remote control.
toroidal transformer which thought the rate of voltage fluctuation and the
leakage flux as important, and a 44,000-micro F mass capacitor are adopted as a
Real-time tone control is adopted as tone control.
This consists of only passive devices required for tone control, has neither
a distortion of the tone circuit itself, nor a problem of S/N, and is
suppressing the influence on a main circuit.
The comparison audition of two MC or two MM is also possible by switch
operation of the front panel.
A Rec out selector, the Subsonic Filter, the direct couple switch, the
mode switch in which a stereo reverse play and a monophonic play are possible, and the loudness control switch are carried.
The high-speed protection
circuit is carried.
|<Power amplifier part>
||Unreturned [ of 0dB ] power amplifier system
(both channel drive, a sine wave continuation output, 20Hz - 20kHz)
|THD (20Hz - 20kHz, Output-power-3dB o'clock)
||0.005% or less
|Cross modulation distortion
(at the time of a 60Hz:7kHz=4:1 and Output-power equivalent amplitude output)
|0.002% or less
|Output bandwidth (IHF, both ch(es) drive,
||5Hz - 100kHz
|Frequency response (at the time of 1W
||1Hz-250kHz+0 -3 dB
|Output load impedance (1kHz)
||Speaker AorB: 4ohms - 16ohms
Headphone: 390mW/eight ohms
|<Preamplifier part (Input
sensitivity/impedance is removed and it is Phono in ->Rec out)>
||The super equalizer system by a direct
||Phono MM: 2.5mV/47kohm
Tuner, Aux, Tape:150mV/47kohm
|The maximum except take-off/Output power
|RIAA deflection (MC/MM)
||0.002% or less (at the time of 1kHz and 8V
|Signal to noise ratio (IHF-A, input short
Aux, Tape: 110dB (at the time of a 150mV input)
||Bass: }8dB (100Hz)
Treble: }8dB (10kHz)
||18Hz, 6 dB/oct
||Low-pass: +7dB (100Hz)
High region: +6dB
|Power consumption (Electrical Appliance and
Material Control Law)
||Width 434x height 132x depth of 407mm