|Marantz Model 1122
||79,800yen(around the 1977 time)
DC stream-composition Integrated Amplifier of a Low
MC head amplifier which realized high gain of 26dB by
adoption of newly developed super low-noise high gain FET and 2SK130A is
FET 2SK130A for audios adopted had the property of FET about 5
duties of the type currently used for the conventional MC amplifier, and has
improved sharply many properties, such as the frequency characteristic, a
distortion, and S/N.
Whole page hardwired-connection OCL and the inverted darlington circuit
which becomes DC stream composition are adopted as a power amplifier circuitry.
The output per ch "65W" is produced.
And the FET cascode bootstrap circuit was adopted as the first rank of
a power fraction, and the problem of a drift is solved. And the phase response
from super-low-pass one peculiar to DC amplifier to a super-high region
and the high level of a transmission capability have realized the very
When using it as a separate type combining other preamplifiers
using the Main In termination of a rear panel and the preamplifier to combine
has fear of occurrences, such as a direct-current leakage, it can use being able
to switch a DC/AC amplifier circuit changing switch to AC.
In order to
prevent oxidization of each termination and to reduce contact resistance, the
gilding treatment was performed to all the input terminals, and the failure of
the tone quality is prevented.
Moreover, the measure against the
consideration which will carry out requests-for-price-quotations component
partses further after careful selection of carrying out, and a stabilization is
fully performed also with the wiring and the using part in the interior of
DC in an excessive current-voltage and outgoing end etc. was
detected momentarily, and the PEP protection network which protects a power
transistor and a speaker is equipped.
This circuitry serves as a safety
design which is equal to the short-circuit for 10 minutes.
microphone jack is carried in the front panel.
The try tone control in
which a Mid range control is also possible is carried.
The bessel type
filter excellent in the roll-off characteristics was adopted, and the
outstanding phase response is secured.
||Stereo Integrated Amplifier
(20Hz - 20kHz, both channel drive)
|Frequency characteristic (20Hz - 20kHz)
||+ 0, -0.2dB
|Cross modulation distortion
||Main-amplifier input: 1.5V/30kohm
Phone man-month: 1.8mV/47kohm
Phone MC: 0.09mV/40 ohms
|An Output power/impedance
||Pre Out: 1.5V/200 ohm
|RIAA deflection (20Hz - 20kHz)
|Input equivalent noise
||0.48 microvolt (a phone and IHF-A)
|Dynamic range (phone)
|Tone control property
||Low: 50Hz, 6dB / oct
High: 5kHz, 6dB /
||180W (Electrical Appliance and Material
||Width 416x height 146x depth of 316mm
||Standard walnut cabinet WC-110 (7,000yen)
Standard mahogany cabinet WC-110N (12,000yen)