|59,000yen(around the 1973 time)
The Integrated Amplifier developed Technics 50A and
based on SU-3600.
The last stage of power amplifier has adopted the
perfect complementary circuit driven while reversing a phase, combining
symmetrically the NPN form which operates by + signal, and the PNP transistor
which operates by - signal.
+ At the change of - signal, switching
distortion which tended to be seen in the conventional circuitry is canceled for
the impossible stream composition into which it is easy to flow through an
electric current and which is not.
Moreover, the distortion is lessened,
while having adopted the whole page hardwired-connection OCL circuitry as a
power amplifier part and maintaining a dumping factor at a flat.
order to make use of the property of a circuitry, the differential amplifier
which uses in a pair the low noise PNP transistor to which the property was
equal to the first rank is adopted, and moreover, the common-emitter circuitry
of the differential amplifier was constituted from a hardwired-connection
circuitry which used the constant current circuit, and has acquired high
The equalizer stage serves as circuitry of the 3 steps of
PNP-NPN-PNP hardwired connection, and especially the first rank used the low
noise PNP transistor selected carefully, took large gain, and has improved the
SN ratio sharply.
the changing point of a curve of a tone control a bass and each treble
it can switch to a two-step and the tone control can rectify a channel
on either side separately.
the object for an
elevation for - descent of the special structure with which this tone control
combined the resistor and the silver conductor -- are a technics type Dual-unit
volume scheme used separately, and while one side is touching the resistor, another side touches a silver conductor -- always -- while is a mechanism in
which only the capacitor is inserted.
Since both of brushes come on a silver
conductor at the middle point, a property completely gentle in a flat is
Moreover, the distorted property is excellent in the circuitry of
a two-step hardwired connection.
The preset volume is adopted as a
If the volume is preset on suitable level, the rotation of a knob
serves as the mechanism of stopping at the location.
interconnection of a tape deck is possible, and a sound recording with two
simultaneous sets and dubbing are also possible.
Three-step switching of
the input impedance of a Phono input terminal is possible.
current flows into a speaker, and the peculiar speaker protection network which
detects a direct current is carried so that a voice coil may not be damaged by
Moreover, by the mistake on usings, such as a connection mistake, the
circuit-protection unit for preventing that a transistor etc. is damaged was
also arranged, and perfectness is measured.
The easy connector type
speaker termination is adopted.
||Solid-state Integrated Amplifier
||Perfect complimentary whole page
hardwired-connection OCL circuitry
|<Power amplifier part>
|Music power (IHF)
|Effective output (IHF)
|Power Band Width (0.2% of distortion)
||5Hz - 50kHz-3dB
||5Hz - 100kHz, and +0 -3 dB
|Distortion (at the time of an effective
||0.2% or less
|Cross modulation distortion (60Hz:7kHz=4:1)
||0.2% or less (at the time of an effective output)
|S/N ratio (IHF)
||110dB or more
||50 (at the time of an 8-ohm load intensity)
||Phono: 2mV/30, 50, 100kohm
AUX: 100mV / 80kohm
|Tapes monitors 1 and 2
||Rec Out: 100mV / 10kohm
Rec/Play(DIN): 100mV / 60kohm, 50mV / 80kohm
|An Output voltage/impedance
||Output power: 1V/200 ohm
|Phono maximum permissible input
||Deflection of less than ±0.5dB from a
Phono:RIAA standard curve
Tuner: 5Hz - 60kHz, and +0 -3dB
AUX: 5Hz -
60kHz, and +0 -3dB
||Bass: 50Hz, +16dB--16dB
frequency: 150Hz, 500Hz
Treble: 20kHz, +14--14dB
||100Hz, +10dB (Volume-30dB)
|The semiconductor used
||Switched: One line
Unswitched: One line
||At the time of an Output power: 70W
||Width 410x height 140x depth of 300mm