The Integrated Amplifier which adopted the super FF
(feed forward) system.
A super FF system is an original system adopted
in the AU-F Extra serieses, and is the technology born by combining the
feed-forward theory which Dr. H-S and Black invented, and NFB.
acts on the distorted modification in an audio frequency band, and also is
carrying out the role which takes out the opposite phase distortion for feed
forward. In the audio frequency band, NFB became an entity, feed forward became an entity out of the audio frequency band then, by this, and distortion is
canceled. All distortion that this generates in the power stage theoretically is
This system consists of symmetrical 2 pole output summing networks
which made full use of the error collection amplifier and the newest computer
technology for amplifying a distorted denial signal.
The super FF system
is adopted as the power amplifier part, and it has whole page
differential-amplification DC amplifier composition.
The cascode bootstrap
interconnection is adopted as the 3rd step for low-noise FET at the first rank.
The dual bridge scheme which strengthens a power source by raising the
utilization factor of energy is developed and adopted at the power-source part.
to the conventional scheme which was rectifying for a positive and negatives [
of two each ] diode, by the dual bridge scheme, the diode of four each is
adopted and the rectification effect is improved 30%.
Moreover, since there
is no power transformer middle point grounding and the grounding point is
insulated from the chassis through diode, the stray current more than needed
does not flow into a chassis, and it does not have an ill effect on a signal
Furthermore, a Tip-of-the-Day grounding scheme is adopted
as all the groundings, and high-quality sound-ization is attained more by making
the circuit for light emitting diode, and a protector circuit into an
The quality of the disk was thought as important in
the equalizer-amplifier part, and the High-precision equalizer is adopted.
This extended the frequency characteristic to 100kHz, and high SN and low
distortion are attained.
Moreover, the MC/man month compatible equalizer
corresponding to MC and man month is adopted by switching gain.
it is stopping with the Subsonic Filter which the record curved and built in a
surge super-low-pass in か student じる, and distortion.
shortest-ization of a signal path, the equalizer part and the power part are
separated completely. Furthermore, flux-free thought was advanced and the
predrive stage and the power stage are isolated with the large-sized heat sink.
It has composition which included the tone control circuit in NF
circuitry of the power part.
All the inputs have adopted the
direct-access input selector which can be chosen by one-touch.
aluminum Naked began to delete in a main volume, and elegance is adopted.
The loudness and the high filter are carried.
||Super FF&DC amplifier
|<Power amplifier part>
|Effective output (10Hz - 20kHz, THD 0.004%)
|THD (at the time of 20Hz - 20kHz, and an
||0.004% or less (8ohm)
|Cross modulation distortion (60Hz:7kHz=4:1,
||0.006% or less (8ohm)
|Dumping factor (new IHF, 1kHz)
|Frequency characteristic (1W)
|TIM distortion (the Sawtooth method)
||Below a limit of measurement
|Input sensitivity/impedance (1kHz)
||Phono1, 2 man-month:2.5mV /, 47kohm
Phono1, 2 MC: 250 microvolts/100 ohms
Tuner, Aux, Tape Play1, 2:200mV /
|Phono maximum permissible input (1kHz)
||Phono MM:170mV(THD 0.01%)
|an Output voltage/impedance (1kHz)
||Tape rec (Pin): 200mV (47kohm)/600ohm
|THD (at the time of 1kHz and 6V output)
||Phono man month: 0.0025% or less
|RIAA deflection (man month, Rec out)
||20Hz-100kHz+0.2 -0.5 dB
|SN ratio (A network, a short circuit)
||Phono man month: 84dB or more
65dB or more
Tuner, Aux, Tape play1, 2:105dB or more
|Channel separation (1kHz)
||Phono: 72dB or more
Tuner, Aux, Tape
play1, 2:90dB or more
||Bass: ±10dB (50Hz)
Treble: ±10dB (10kHz)
|A high filter
||10Hz (-3dB, 6 dB/oct)
||100Hz (+8dB), 10kHz (+5dB)
||Width 430x height 112x depth of 334mm