Audio Database


Marantz PM-80 65,000yen(around the 1989 time)

The Integrated Amplifier developed at last the newest digital source studied in addition to the traditional amplifier technology of a Marantz.

In addition to a large-sized power transformer, the special edition electrolytic capacitor of 18,000 micro Fx2 is adopted as a power-source part.
Moreover, the OFC line of a very thick is adopted as a speaker circuitry or a power cord.

In order to stop the rectification noise generated when changing an alternating current into a direct current, the noise-killer circuitry is carried.
The RF noise near 1MHz is intercepted from several 100kHz, and reservation of the tone quality without muddiness is aimed at.
Furthermore, it has succeeded in increasing a low-pass feeling of power by lowering the primary side circuit impedance of a power source.
Moreover, the noise is thoroughly eliminated by leading about and the careful circuitry of a product line.

A power stage is the stream composition which made the power transistor of Pc-100W which was rich in the linearity the parallel push pull, and is raising the gain as a three-step Darlington connection.
Moreover, the copper shielding board was mounted on the power transistor, the radiation from a transistor and an oscillation were suppressed, and the influence on a very small signal is eliminated thoroughly.

The phone equalizer constitutes low-noise amplifier with the combination of low-noise FET and IC for audios.
Moreover, by attenuating super-low-pass one of 30Hz or less, modulation by low frequency was prevented and the still wider dynamic range has been obtained.

What was selected carefully is used for a part and the high-quality sound electrolytic capacitor which uses for a separator the paper with which the fiber type protein fibroin and Manila hemp of silk were mixed is adopted especially as a signal system.
Moreover, the paper polyesters substrate excellent in vibration suppression nature is used for the printed circuit board.

When a "first class" and large power are required at the time of the Koide power, "the Class-A / AB class circuit changing switch" which can perform proper use of "Class AB" are equipped.
In order to avoid the influence on the signal current, the circuitry arranged near the power-source block of a voltage change circuitry is adopted. Moreover, for a bias change, shortest-ization of distance is attained using remote control by a photo-coupler, and the influence on a tone quality is suppressed to the minimum.

The Source-Direct switchpoint into which the conventional direct switchpoint was developed further is equipped.
All of switchpoints and tone control circuits, such as not the defeet of a tone control but a tapes monitor and a processor, are jumped, and it is direct inputted into power amplifier through an exclusive volume.

Five input terminals and three tapes input/output terminals are carried.
Moreover, it is also possible to also carry the processor termination and to connect a graphic equalizer etc.

Power Electrolytic Power
Noise-killer Power

Rating of a mode
Form Stereo Integrated Amplifier
Output power (20Hz - 20kHz, both channel simultaneous drive)
Class AB : 140W+140W (4ohms)
120W+120W (6ohms)
100W+100W (8ohms)
Class A : 20W+20W (8ohms)
Dynamic power
Class AB : 340W+340W (2ohms)
220W+220W (4ohms)
170W+170W (6ohms)
THD (1kHz, 8-ohm load intensity) 0.0008%
Cross modulation distortion (SMPTE) 0.008%
Output bandwidth (an 8-ohm load intensity, 0.03%) 10Hz - 50kHz
Frequency characteristic compact disk and a Source Direct: 10Hz-100kHz+0 -3 dB
Dumping factor 180 (an 8-ohm load intensity, 20Hz - 10kHz)
Input sensitivity/impedance Phono MC: 250 microvolts/100 ohms
Phono man month: 2.5mV/47kohm
High SFT Level: 150mV/33kohm
Phono maximum permissible input (1kHz) MC:16mV
RIAA deflection (20Hz - 20kHz) ±0.2dB
SN ratio (A network) Phono MC:75dB
Phono MM:85dB
High Level:105dB
Tone control Bass: 100Hz, ±6dB
Treble: 10kHz, ±6dB
Power source AC100V, 50/60Hz
Power consumption 220W (Electrical Appliance and Material Control Law)
Dimensions Width 454x height 165x depth of 380mm
Weight 17.5kg