| Marantz PM-15 | 450,000yen(around the 1994 time) |
The highest-class Integrated Amplifier which supplied all the technologies of the Marantz and was developed as a pure audio model which reached to an extreme of a modification of S/N on Hearing impression which PM series has hammered out consistently, and the reservation of high S/N at the time of a real using. Two kinds of type of outputs of the Class-A / AB class adopted since PM-80 are unified to AB class. The Class-A scheme was omitted from the circuitry, and though it is a stream composition of only AB class circuitry, the new power block which can also be said to be the super AB class which realizes the quality at the time of a Class-A output is developed and adopted. Moreover, the bipolar transistor for RFs (Pc=200W) is adopted as a device by the parallel push pull, and high electric-current drive capacity is secured to it. The layout which made the pre part and the power part become independent completely is adopted, and the mutual electric interference is eliminated. Moreover, a balance scheme is adopted as both interconnection and the ill effect to the music signal by the noise from the outside is stopped. Especially in the 4-unit active volume adopted as the volume part, the resistor rotation type volume of a low impedance specification which was excellent as volume component partses is adopted. The full-scale low-noise amplifier stream composition, such as head amplifier of a push pull differential circuit, is adopted as a phone equalizer part. While having adopted the double-sided foil printed circuit board of 70micro thickness as a substrate and improving shielding nature, reservation of the drive capacity corresponding to the speaker of a low-impedance is aimed at. HDAM which is a unit original with a Marantz is adopted. This is what adopted the shielding structure by the copper case or a multilayer substrates, and demonstrates the performance which suppressed heat, an oscillation, and the influence from electromagnetic waves, and was stabilized. In addition to a low-noise high slew rate, this has realized the space efficiency and the high stability which are the merits of IC. The copper plating was given to the extra-large toroidal power transformer which gave the copper plating as a measure against a RF noise, and also a low foil scaling-factor electrolytic capacitor is adopted, and the stable powering is made possible. Moreover, in order to realize sound which stops a rectification noise and does not have muddiness, the noise-killer element is carried in power, the pre, and the control part, respectively. Based on the zinc die-casting chassis which gave the copper plating, the chassis is constituted from the front panel of the top plate which uses the steel plate of 3mm thickness, and aluminum extrusion material, and the leg which began to delete a pure-copper block, and has eliminated the oscillation thoroughly. All input/output terminals plated with gold, and also they have adopted the same large-sized sticking-by-pressure type speaker terminal as what was adopted by PM-99SE. |
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