Audio Database


52,800yen(May, 1970 release)

A tone quality, a functionality, and possibilities are the Integrated which investigated relevance with a speaker system and were produced by the design which is full of functional beauty from the first.

The main-amplifier part serves as a two-step differential-amplification circuitry, and the full hardwired connection by plus-or-minus 2 power source of the output capacitor less which uses PNP and NPN also for an output transistor and a perfect complimentary darlington circuit scheme.
For this reason, equal NF started throughout the audio from the direct-current region, the dumping factor and the output characteristics became fixed to super-low-pass one, the disorder by the super-low-pass one of a speaker decreased sharply, and the cross modulation distortion of amplifier and a speaker has decreased.
Moreover, since a distorted component is negated with the combination of PNP and NPN, distortion by the amplifier itself is also pressed down low.

The low-noise silicon transistor sorted out is made especially a preamplifier part, it has, and the noise is made small to the threshold.

In order that phase distortion may not use the bad large electrolytic capacitor of a transmission characteristics for a coupling capacitor, a hardwired-connection circuitry is used as much as possible, a capacitor is made high, and the Mylar capacitor is used.
Moreover, electrolysis used the Mylar type for the surely required fraction in parallel, and has improved the high region property.

In addition to Bass and Treble, the triple tone control which can also adjust Midrange is carried.
right and left -- since it can adjust separately, a special NetWare program and a more exact correction of a room acoustic are possible.

It is also possible to separate and use a preamplifier part and a main-amplifier part.

Two speaker outputs, A and B, are carried.

The exclusive transistor and the differential-amplifier stabilization circuitry which makes the two-step differential amplifier stabilize the differential amplifier are adopted as a temperature warranty.
Moreover, it protects perfectly using six immediate judgment fuses even in an emergency.

The ripple-filter circuitry which became independent, respectively is attached to a positive, negative power source, and preamplifier power source of a main amplifier, and the power source is stabilized.

A low NF type filter, a high filter, a loudness control, the tapes monitor circuitry, the headset jack, the muting switch, the mike input jack, etc. are carried.


Rating of a mode
Form Stereo Integrated Amplifier
<Main-amplifier part>
Output power
Music power (IHF) : 100W (4ohm)
80W (8ohm)
Effective output : 45/45W (4ohm)
35/35W (8ohm)
THD 0.5% or less (Output power)
Cross modulation distortion (SMPTE, 60Hz:7kHz=4:1) 0.5% or less (Output power)
Power Band Width (IHF) 10Hz - 40000Hz (8ohm)
Frequency characteristic 10Hz - 70000Hz, }1dB
Channel separation 60dB or more (1kHz, Output power)
A hum and a noise (IHF) 100dB or more
Input sensitivity/impedance 1V (Output power) / 50 kohms or more
Load impedance 4ohm-16ohm
Dumping factor 40 (8-ohm load intensity)
<Preamplifier part>
Output voltage Maximum output: 5V
Output power: 1V
THD 0.1% or less (Output-power voltage)
Frequency characteristic 20Hz - 40000Hz, }1dB
Channel separation Phono1, 2:50dB or more
Tuner, AUX: 50dB or more
A hum and a noise (IHF) Phono1, 2:70dB or more
Tuner, AUX: 80dB or more
Input sensitivity (1kHz, Output-power voltage)/impedance Phono1, 2:2mV / 50kohm
MIC: 3mV / 50kohm
Tuner: 180mV / 100kohm
AUX: 180mV / 100kohm
Tape Play(Pin): 180mV / 100kohm
Tape Recorder(Din): 180mV / 100kohm
Sound-recording output Tape Rec(Pin):180mV
Tape Recorder(Din):30mV
Equalizer Phono:RIAA NF type
MIC:Flat NF type
Control Bass: 30Hz, }16dB
Midrange: 1500Hz, }5dB
Treble: 15000Hz, }15dB
Switchpoint A low filter: 20Hz-10dB
A high filter: 20kHz-10dB
Muting -20dB
Stream composition Transistor: 31
Diode: Five
Supply voltage 100V, 50Hz/60Hz
Power consumption 240W
Dimensions Width 415x height 127x depth of 278mm
Weight 9.75kg