|Marantz Model 1120
||175,000yen( at the 1972 time(?))
The Integrated Amplifier which attained
simple-ization of the circuitry and aimed at the high-definition balance.
The whole page direct coupling system which adopted the
differential-amplification circuitry as the top is used for a power amplifier
The thing of the pair was completely made in two stones of the
differential-amplification stage, it acted to one as a couple of these two, the
status same thermal completely was maintained, and the property excellent in one
step has been acquired.
A careful phase correction, such as making
temperature compensation perfect at each part using diode, or using an empty
core special coil, in order not to degrade the distortion of a high region, is
Moreover, the special article by joint development of a Marantz
and Motorola, Inc. is adopted as a power transistor.
A protection network is the same type as Model 500, and when there is the
leakage current to a speaker, the relay operates and it serves as OFF.
Moreover, in order to prevent the it1 sound of the instant rush current
at the time of Switchpoint ON etc. to serve also as a muting, timing is
shifted by the relay until amplifier goes into perfect operating state.
The equalizer stage of a pre part has adopted a two-step stream
composition, and a differential-amplification circuitry is adopted as the head
and it has adopted the SEPP pure complementary circuit as a final stage.
Moreover, the inside of the feedback loop is a full hardwired connection, and has hung the negative feedback covering two steps.
A 1.0-micro F
capacitor is inserted in the top of a differential circuit, an unnecessary high
region component is cut, and in order to remove the it1 at the time of an
equalizer change completely, the resistor of 22Mohm is inserted.
It is the stream composition of having adopted the two-step hardwired-connection type also as the tone circuitry, having had a differential-amplification circuitry in the head, and having pressed down the final stage with ± balance power source. By the scheme which gives selectivity to a negative feedback circuitry and carries out elevation descent, two steps usually consider a further feedback as a sake, an input impedance is maintained greatly, and the Output load impedance is made small.
In the filter stage, Law Hy has adopted CR type.
+ and - side makes the power source for preamplifiers the
constant-voltage regulated power supply which served as the perfect ripple
Almost all parts are rendered to the printed circuit board of six sheets in all, and all also of switchpoints and a rotary switch have adopted
the substrate type. Moreover, the shield wire usually taken about from an input
terminal to a multiple contact switch does not exist except for one place.
This is aiming at the radical breakthrough of the problem that sound changes
with a product line which poses a problem with a high-class machine etc.
It changed into the usual wire wrapping method, the way of stopping a
lead wire using a wire clamp is adopted, and it has the structure where each
substrate can be adjusted independently even afterwards.
coating is given in order that the printed circuit board may also prevent an
etching and breakage to a Copper foil in consideration of secular change.
Switchpoints had a switchpoint in the really required location by
lengthening a shaft, and it has realized the shortest connection.
order to prevent the induction noise from the outside, the integral shielding of
the reverse side of an input terminal plate is carried out by the Copper foil.
Moreover, non-contact-ization is achieved in order to prevent mixing of dust
etc. by the Austria relay [ special contact ].
Furthermore, four provide the
space which enters in the center and the fist avoids the cross interferencee.
The scope out termination which can monitor the phase response of a
cartridge etc. is carried.
||Console stereo amplifier
|<Power amplifier part>
|Continuous rating output
20Hz - 20kHz)
||0.2% or less (at the time of 20Hz - 20000Hz, and an Output power)
|Cross modulation distortion
||0.2% or less (at the time of 20Hz - 20000Hz,
SMPTE, and an Output power)
|a power band -- the Wiz
||10Hz - 40000Hz
||Low Level:1.1mV to equal 1.1V output at
High Level:110mV to equal 1.1V output at Pre-Amp out
||Low SFT Level(Phono): 47kohm
High SFT Level: 25kohm
||From magnetic phono input to Speaker
Better than 140dB below 60W (8ohm load)
||Width 390x height 133x depth of 349mm