Marantz SM-6

Commentary

Stereo power amplifier capable of switching between pure A class and AB class.

Pure class A operation is adopted, and the output for pure class A is 30W/ch. It can also be used as class AB operation of 120W/ch by switching the switch.

In addition to introducing an advanced low-TIM design, we use carefully selected materials.
The power transistor is a high-speed high-fT transistor with a sufficient collector loss margin and superior high-frequency characteristics. This transistor has a cutoff frequency of 90 MHz, which suppresses switching distortion that cannot be avoided in class AB, and flattens high-frequency phase characteristics.
In addition, all stages have a complete push-pull DC amplifier configuration to improve the bare characteristics and reduce the amount of NF. The TIM distortion is reduced without compromising the static characteristics. In addition, DC drift, which is a problem in DC amplifiers, is controlled by parts with ideal characteristics and DC servo circuits, ensuring high reliability.

Heat generated by pure class A operation is radiated by heat pipe system. Heat pipe leads heat out of circuit and radiator radiates heat.

The condenser is a 22,000 μ F super audio condenser designed for both characteristics and listening performance. It emphasizes rich musical quality that does not appear in data.
The transformer is filled with a special resin to prevent heat resistance and to make it compact.

Equipped with a large high-precision power meter with logarithmic compression indication, the power at 8 Ω load can be read directly, and with a Class A switch, power switch, two speaker selector and simultaneous playback in a traditional sub-panel for a simple design.

* The photograph is equipped with a separately sold mahogany cabinet.

Model Rating

Type	Stereo power amplifier
Rated output (20 Hz to 20 kHz, both channel drive)	120W + 120W (Class AB) 30W + 30W (Class A)
Total harmonic distortion factor	0.015% (20 Hz to 20 kHz, 8 Ω load at effective output)
Cross modulation distortion factor	0.015% (at 60 Hz : 70 kHz = 4 : 1, effective output)
Frequency characteristic	20 Hz to 20 kHz : + 0, -0.2 dB + 0, -5dB : 5 Hz to 100 kHz
Input Sensitivity / Impedance	1.5V/47k Ω
Damping factor	100 (1 kHz, 8 Ω Load)
Signal-to-noise ratio	118 dB (IHF-A curve)
Rated power consumption	Electrical Appliance and Material Control Law : 320W
Pwer	100 V, 50/60Hz
External dimensions	Width 416x Height 146x Depth 332 mm
Weight	14.5kg