Audio Database

The pictorial image of Model 1122

Marantz Model 1122 79,800yen(around the 1977 time)

Description
 
DC stream-composition Integrated Amplifier of a Low TIM design.

MC head amplifier which realized high gain of 26dB by adoption of newly developed super low-noise high gain FET and 2SK130A is carried.
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 flat play.

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 amplifier.

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.

The 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.




Rating of a mode
Form Stereo Integrated Amplifier
Output power
(20Hz - 20kHz, both channel drive)
65W+65W (8ohms)
80W+80W (4ohms)
Frequency characteristic (20Hz - 20kHz) + 0, -0.2dB
THD 0.03%
Cross modulation distortion 0.03%
Dumping factor 60
Input sensitivity/impedance Main-amplifier input: 1.5V/30kohm
Phone man-month: 1.8mV/47kohm
Phone MC: 0.09mV/40 ohms
High: 180mV/25kohm
An Output power/impedance Pre Out: 1.5V/200 ohm
RIAA deflection (20Hz - 20kHz) ±0.3dB
Input equivalent noise 0.48 microvolt (a phone and IHF-A)
Dynamic range (phone) 112dB
Tone control property bass(100Hz): ±10dB
mid(700Hz): ±6dB
treble(10kHz): ±10dB
Filter Low: 50Hz, 6dB / oct
High: 5kHz, 6dB / oct
Power consumption 180W (Electrical Appliance and Material Control Law)
Power source 100V, 50Hz/60Hz
Dimensions Width 416x height 146x depth of 316mm
Weight 12.5kg
Option Standard walnut cabinet WC-110 (7,000yen)
Standard mahogany cabinet WC-110N (12,000yen)