Marantz PM-6

Commentary

A pre-main amplifier that adopts the design of separate amplifier SC-6 and SM-6.

Pure A-class 30W + 30W with full push-pull DC configuration for all stages. The power is high in freshness and does not cause switching distortion in principle.
In addition, it can be changed to AB class 120W/ch with a single switch. In order to reduce the difference in sound caused by switching, a high-speed high-fT transistor with a cut-off frequency of 90 MHz is adopted in the power stage. Switching distortion, which was said to be a weak point of AB class, is minimized, and it is finished as a delicate yet powerful AB class amplifier.

Low-TIM design for the control amplifier as well as the power amplifier. Carefully selected materials and sophisticated circuitry improve the bare characteristics. The amount of NF is reduced to eliminate audible distortion.

The power supply uses a newly developed 22,000 μ F super audio capacitor and a compact transformer filled with special resin and heat-resistant measures.
In addition, a heat pipe with a high heat exchange rate is installed in the heat radiation mechanism to cool the high heat generated during pure A class operation.

Equipped with a straight DC switch that connects the phono amplifier directly to the power stage in order to improve the quality of disc playback.
For this reason, each block has a low distortion and a high S/N ratio, and the MC head amplifier, which handles minute signals, uses transistors with a single channel of as much as 13 koku, and is polished to a level that is sufficiently valuable as a single unit.
In addition, the phono input switch is equipped with a cartridge load selector of 27k Ω, 47k Ω and 100k Ω, so it can be used with any cartridge.

The tone control is independent on the left and right. The loudness circuit is equipped with a 2-point type that can be adjusted by + 8 dB and + 4 dB at 100 Hz. It can be adjusted to critical according to the characteristics and volume of the listening room.

Equipped with a speaker selector switch capable of simultaneous playback and switching.

Uses a subsonic filter to cut out unwanted ultra-low frequencies.

Equipped with mutual dubbing circuit by two decks.

Model Rating

Type	Stereo pre-main amplifier
Rated output (20 Hz to 20 kHz, both channels driven simultaneously)	120W + 120W (8 Ω, Class AB) 30W + 30W (8 Ω, pure Class A)
Total harmonic distortion factor	0.015% or Less (Effective Output, 20 Hz to 20 kHz, 8 Ω Load)
Cross modulation distortion factor	0.015% or Less (8 Ω at 60 Hz : 7 kHz = 4 : 1, Effective Output)
Frequency characteristic	+ 0, -0.2 dB (20 Hz to 20 kHz) 5 Hz to 100 kHz (+ 0, -2dB)
Damping factor	100 or More (8 Ω Load, 1 kHz)
Input Sensitivity / Impedance	Main amplifier input : 1.5V/100k Ω phono1 mm : 2.2mV/27k Ω, 47k Ω, 100k Ω phono2 mm : 2.2mV/47k Ω phono2 mc : 200 μ V/75 Ω TAPE, TUNER, AUX : 150mV/40k Ω
Rated Output / Impedance	PRE OUT : 1.5V/220 Ω TAPE OUT : 150mV/600 Ω
RIAA deviation	± 0.2 dB (20 Hz to 20 kHz)
Tone control characteristics	± 8 dB (Low Frequency 100 Hz) ± 8 dB (high frequency 10 kHz)
S/N ratio (IHF-A)	phono MM:86dB phono MC:68dB TAPE, TUNER, AUX : 110 dB
Phono maximum allowable input	MM:220mV(1kHz) MC:20mV(1kHz)
Power consumption	Electrical Appliance and Material Control Law : 350W
Pwer	100 V, 50/60Hz
External dimensions	Width 416x Height 146x Depth 332 mm
Weight	15.5kg