Marantz MA500 35,000yen(1993 release)

Monophonic power amplifier corresponding to a hi-fi audio-video system.

The discrete circuit is adopted.

The BTL interconnection which combined two sets is possible.

By arranging five sets in parallel, it is just set to audio-video500 with a setting size. 

Form	Monophonic power amplifier
Output power	130W (8 ohm, RMS)
THD	0.05%
Frequency characteristic	10Hz - -100kHz one dB
Rated input level	1Vrms
SN ratio (A curve)	95dB
Dumping factor	170
Power consumption	145W
The maximum Dimensions	Width 84x height 132x depth of 450mm
Weight	6kg

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Marantz MA-23 90,000yen(around the 1994 time)

Not a mechanism but monophonic power amplifier of the music linking series which put the viewpoint on music play capacity and was developed.

The output of 50W is secured by AB class, and the margin is given to the power-source part so that it can drive also with the speaker of a low-impedance.

The copper plating chassis metallurgy plating output-terminal is adopted. 

Form	Monophonic power amplifier
Output power (20Hz - 20kHz, 0.01%)	50W (8ohm)
THD	0.01%
Frequency characteristic	10Hz-100kHz+0 -1 dB
SN ratio (A curve)	110dB
Input sensitivity/impedance	1V/47kohm
Power consumption	55W
The maximum Dimensions	Width 250x height 84x depth of 215mm
Weight	6kg

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Marantz MA-9S1 650,000yen(October, 2002 release)

　
It is the monophonic power amplifier which improved thoroughly the power amplifier circuitry, and a power source and a feed line, and realized the conventional about 3 time (150A SM-5 ratio) thing momentary-current supply capacity.

In order to suppress the influence from counter-electromotive force to the minimum, the amplifying circuit is considered as 2 amplifier stream compositions of voltage amplifier (voltage amplifying circuit) 23dB of 3 parallel push pull full balance stream composition, and power buffer amplifier (power amplification circuitry) 6dB.

The ripple component of a rectification wave has adopted very little choke input scheme strong also against a load variation as the power circuit for voltage amplifier. Thereby, since there is also little power-source higher harmonic, the noise to the off-site audio equipment through a primary side can be reduced.
The noise which invades from a primary side is also reduced. And the clean power source can be conjointly supplied to the small signal circuitry with "schottky diode / noise-killer element."

The impedance has adopted as the power-source part for power buffer amplifier the capacitor input scheme which makes large-current supply capacity elated low. The large-current supplying is enabled by the super-low-impedance block capacitor, very-thick distribution cable, and thick foil substrate which were developed to the super ring large-sized toroidal transformer or the special purpose.

In order to aim at a feedback-impedance reduction of a current feedback circuit and to realize further high speed-ization, the separate module HDAM SA for buffer amplifier to which HDAM of Marantz original was evolved further is newly developed, and it carries in MA-9S1.
In MA-9S1, it carries in the power buffer amplifier part at two pieces and four voltage amplifier parts.

The center power meter is carried.

A six-step Attenuator is carried.

It begins to delete to an imbalanced input terminal, and the gilding terminal is used.
Moreover, the speaker terminal by German WBT is carried in the speaker termination corresponding to bi-wiring.

About 7.0kg large-sized aluminum extrusion heat sink is adopted.

The copper plating double layered bottom chassis of thickness "3.2mmx2" is adopted. 

Form	Monophonic power amplifier
Output power (20Hz - 20kHz)	600W (4ohm) 300W (8ohm)
THD (20Hz - 20kHz, 8ohm)	0.01%
Output bandwidth (an 8-ohm load intensity, 0.05%)	5Hz - 55kHz
Frequency characteristic (1W or 8-ohm load intensity)	3Hz-120kHz+0 -3 dB
Dumping factor (8 ohm, 20Hz - 20kHz)	200
Input sensitivity/impedance	Balanced: 1.7V/20kohm Unbalanced: 1.7V/20kohm
S/N (IHF-A network)	Balanced:120dB Unbalanced:120dB
Voltage amplification	Balanced:29dB Unbalanced:29dB
ATT set point	0, -3, -6, -9, -12, -infinitydecibel
Supply voltage	AC100V, 50Hz/60Hz
Power consumption	450W (Electrical Appliance and Material Safety Law) 1200W (at the time of a 4-ohm Output power)
The maximum Dimensions	Width 459x height 198x depth of 451mm
Weight	35.8kg
Adjunct	AC cable

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Marantz MA-7A 180,000yen(around the 1994 time)

Not a mechanism but monophonic power amplifier of the music linking series which put the viewpoint on music play capacity and was developed.

The power MOS FET strong against a high order distortion is adopted as an output stage with the parallel push pull stream composition, and the output of 30W by a pure Class-A is possible.
Moreover, the power-source part is strengthened so that the speaker of a low-impedance can also have and drive a margin.

The copper plating chassis and the gilding input/output terminal are adopted. 

Form	Monophonic power amplifier
Output power (20Hz - 20kHz, 0.008%)	30W (8ohm)
THD	0.008%
Frequency characteristic	10Hz-100kHz+0 -1 dB
SN ratio (A curve)	115dB
Input sensitivity/impedance	0.5V/47kohm
Power consumption	105W
The maximum Dimensions	Width 208x height 163x depth of 359mm
Weight	10kg

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Marantz MA-7 150,000yen(one-set, around the 1988 time)

Monophonic power amplifier which carries the output stage of MOS FET.

A pure Class-A operation of Output 30W (8ohm) and AB class operation of Output 120W (8ohms) can be switched with the switchpoint of a back panel.

The phase inversion circuitry for bridge connection is built in, and the BTL interconnection can be simply performed in a circuit changing switch and attached code.
The BTL interconnection connects MA-7 to a two-set single row, and realizes the high power of 350W (8ohm).
The point that the distorted component which comes out of two more sets of amplifier is canceled, the point which the detrimental constituent resulting from grounding potential is eliminated, and a clean grounding realizes since the load current does not flow into an earth line, etc. are raising the tone quality.

In order to be able to input a compact disk player etc. direct, I have set Input sensitivity as 1V.

The inverted switchpoint which reverses 180 degrees of phases of an output is carried in the rear panel, without changing an interconnection of a speaker.
By controlling the phase of each band, relation of the sound near a crossover can be adjusted finely. 
Monophonic power amplifier which carries the output stage of MOS FET.

A pure Class-A operation of Output 30W (8ohm) and AB class operation of Output 120W (8ohms) can be switched with the switchpoint of a back panel.

The phase inversion circuitry for bridge connection is built in, and the BTL interconnection can be simply performed in a circuit changing switch and attached code.
The BTL interconnection connects MA-7 to a two-set single row, and realizes the high power of 350W (8ohm).
The point that the distorted component which comes out of two more sets of amplifier is canceled, the point which the detrimental constituent resulting from grounding potential is eliminated, and a clean grounding realizes since the load current does not flow into an earth line, etc. are raising the tone quality.

In order to be able to input a compact disk player etc. direct, I have set Input sensitivity as 1V.

The inverted switchpoint which reverses 180 degrees of phases of an output is carried in the rear panel, without changing an interconnection of a speaker.
By controlling the phase of each band, relation of the sound near a crossover can be adjusted finely. 

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Marantz MA-5 100,000yen(1979 release)

Monophonic power amplifier which realized the pure Class-A operation by 30 W/ch.

An ideal construction without the interference between channels is obtained by having a monophonic stream composition, and an electrical properties and a linearity are also good and make sound of a pure Class-A still more beautiful.

A changeover of a switchpoint realizes quality AB class 120 W/ch of a switching distortion and crossover distorted relative minimum a high speed high fT transistor and on the basis of an original Low-TIM design.
Furthermore, the stream composition of a platform also determines a tone quality as a first priority, and consideration of sound is carried out even to the detail.

As for the power meter, conventional not a bar graphical representation but light emitting diode are indicating the output by the point.

The high-speed response type protection network where a thermal sensor detects the temperature of a heat sink directly is adopted.

A selection of AC amplifier and DC amplifier can be performed, moreover it does not pass along SW but few gilding direct input terminals of a tone-quality failure are carried.

The power switch and the gain control are stored to the traditional sub panel. 

Form	Monophonic power amplifier
Output power (20Hz - 20kHz)	120W (at the time of 8 ohms and AB class drive) 150W (at the time of 4 ohms and AB class drive) 30W (at the time of 8 ohms and a pure Class-A drive)
THD	0.01% (8 ohms, 20Hz - 20kHz)
Cross modulation distortion	0.01%
Frequency characteristic	20Hz-20kHz:+0, -0.2dB + 0, -1 dB:DC-100kHz
Input sensitivity/impedance	1.5V/30kohm
Dumping factor	100 (8-ohm load intensity) or more
Remains noise (IHF-A curve)	0.034mV
Power dissipation	Electrical Appliance and Material Control Law: 150W
Power source	100V, 50/60Hz
Dimensions	Width 208x height 146x depth of 334mm
Weight	10kg

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Marantz DMA-1 125,000yen(1989 release)

Monophonic power amplifier developed as power amplifier which becomes a basis of the theme "the music play highest with the highest technology" with DAC-1 and a pair.

The output stage has parallel push pull composition.

The toroidal type of a low loss and low leakage magnetic flux is adopted as a power transformer.

The noise is reduced by the copper plating chassis. 

Form	Monophonic power amplifier
Output power	50W (8 ohms, 20Hz - 20kHz, THD0.01%)
THD	0.01%
Frequency characteristic	10Hz-100kHz+0 -1 dB
Input sensitivity/impedance	1V/47kohm
SN ratio (A curve)	110dB
Power source	AC100V, 50Hz/60Hz
Power consumption	55W (Electrical Appliance and Material Control Law)
The maximum Dimensions	Width 250x height 84x depth of 215mm
Weight	6kg

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Marantz Model 9 replica 390,000yen(1995 release)

Monophonic power amplifier which reproduced faithfully Model9 which is an excellent article of former years of a Marantz.

In order to reproduce the excellent article of former years, the workshop of a North Carolina is taking charge of a production by the operation of marantz USA Inc. in a Chicago.

The part which must be changed by transition of component partses which cannot be obtained, such as an oil tubular capacitor and a selenium rectifier, or a safety standard side selects the component partses which may be obtained, and the component partses which can be restored are newly raised and are brought close originally, such as keeping an original structure, how to construct, and the product-line way.

The power cable serves as a inlet type and the power transformer is presupposing the changed part at the circumference of AC primary that a thermal fuse is entered using the safety standard qualification article of each country.
Moreover, the speaker terminal is changed.

The Valves employed is selecting carefully and using GE and Golden Dragon.

It is supposed in circuitry except the input buffer side and OPT sub- side adjusting resistance that it is the same also including the constant. 

Form	Tube monophonic power amplifier
Output power	Underwriters-Laboratories interconnection, 30Hz - 20kHz : 70W (4ohms) 70W (8ohms) 70W (16ohms) A triode interconnection, 30Hz - 20kHz : 40W (4ohms) 40W (8ohms) 40W (16ohms)
THD (1kHz, 1W, 8ohm)	0.03%
Frequency characteristic (1W, 8ohm)	20Hz-40kHz±1dB
Input sensitivity/impedance (70W)	1.2V/150kohm
S/N ratio (EIAJ)	90dB
A low cut-off filter	10Hz-3dB
Supply voltage	AC100V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law)	210W
Dimensions	Width 391x height 212x depth of 266mm
Weight	23.0kg

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