Audio Database

The

Marantz Model 1200 295,000yen(at the 1972 time(? ))

Description
 
The Integrated Amplifier which packed control amplifier Model3300 and the Koide power version of power amplifier Model240 into one.

Except for the difference in an output, the circuitry of a main part is the same stream composition as Model240, and has adopted the differential amplification, the pure complimentary, and the whole page hardwired-connection OCL circuitry.
Moreover, the transistor of a pair is prepared for the completeness chosen also as the differential-amplification stage or the output stage of a push pull, and it is adjusted so that the basic circuit itself may carry out a direct-current balance completely naked. The power transistor is used with 2 stone parallel push pull.
Moreover, an idling electric current is fully sent, and while AB class operation is maintained also at the time of low level and it decreases a notching distortion peculiar to a transistor etc., the higher-order and the oddth distorted measure are performed.

The pre part serves as the same circuitry as Model 3300, and has adopted the hardwired-connection circuitry where the equalizer stage, the tone control stage, and the amplification stage also used the differential circuit for the first rank.

About the contact of the switchpoint, gilding is not used easily, but a contact surface product is fully taken, and the method of adjusting contact resistance moderately is taken.

A cut core is used for a power transformer and the flux itself is held down to it by the transformer around which the short ring was wound.


Rating of a mode
Form Console stereo amplifier
<Power amplifier part>
Continuous rating output
(Both channel, 20Hz - 20kHz)
4ohm: 125W+125W
8ohm: 100W+100W
16ohm: 50W+50W
THD 0.15% or less (at the time of 20Hz - 20000Hz, and an Output power)
Cross modulation distortion 0.15% or less (at the time of 20Hz - 20000Hz, SMPTE, and an Output power)
Frequency characteristic 6Hz-80000Hz+0 -3 dB
20Hz-20kHz±0.25dB
a power band -- the Wiz 10Hz - 40000Hz
Dynamic range 100dB
Channel separation 60dB
Dumping factor 100 (8ohms)
Tone control Treble: ±10dB (10kHz)
Bass: ±10dB (100Hz)
<Preamplifier part>
Input sensitivity/impedance Phono: 1.35mV/47kohm
High SFT Level: 135mV/100kohm
An Output voltage/impedance Tape Recorder: 3V/1kohm
Headphones: More than 3V/8ohm
Center Channel: 3V/1kohm
Filter High Filters: 5kHz, 9kHz
Low Filters: 50Hz, 100Hz
<Synthesis>
Power source AC100V, 50Hz/60Hz
Power consumption 420W
Dimensions Width 390x height 146x depth of 356mm
Weight 14.1kg