Audio Database


Pioneer M-Z1
300,000yen(around the one-set and 1980 time)

Unreturned monophonic power amplifier which removed the NFB loop from the signal system by the super linear circuit.

The super linear circuit is adopted as a voltage amplification part.
The linear amplification was realized without using NFB because this cancels the nonlinearity of a transistor with a transistor with the nonlinearity in the reverse mode, and the problem resulting from NFB is solved.

EBT (ensemble power transistor) with a high-speed responsibility is adopted as an output stage.
In order to obtain a linearity, the electric-current burden per one stone is made light, and it is parallel six pieces, and is used, and pure class A amplification is carried out. The high region play which tends to pose a problem by this has also improved.

In order to attain DC stabilization of an outputting point, the double locked servo regulator who suppresses a variation of a middle point voltage and improves the robustness of a super linear circuit further is employed.
Furthermore, it has the whole page hardwired-connection stream composition which removed the coupling capacitor constituting the cause of coloring of sound.

Two power transformers are used for a power-source part, and source impedance is reduced by equivalence parallel connection, and also the power-source drive to an output stage is strengthened.

In order to remove the factor of a tone-quality failure, the glasscase electrolytic capacitor which changed the case into the glass from conventional aluminum is adopted. High-quality sound-ization is attained more by giving a carbon coating to a glasscase inside, and also adding an enhancement to electrode foil.
Moreover, the Copper-foil styrene capacitor which uses oxygen free high conductivity copper of a high purity for electrode foil is adopted as the capacitor of a small capacity, and the improvement in a tone quality is aimed at.

It changed to the iron cap, the brass cap carbon resistor which adopted brass cap carbon as the drawer part is adopted as a carbon resistor, and the distorted occurrence is suppressed.

Equalization of the shielding effect is attained by using the aluminum material which is non-magnetic material for all, such as a chassis and a frame, and also coating a special resin inside.
By these non-magnetic-material structuring, the failure of the biography trouble and property resulting from a magnetic-substance structure is reduced sharply.

To the printed circuit board, a mechanical intensity is high, and the glass epoxy which was excellent in the RF property is adopted. Furthermore, the Copper foil is made to reduce direct current resistance and an inductance by giving one about 4 times [ over the past ] thickness of 140micro of this.
Moreover, oxygen free high conductivity copper is adopted as the place which uses oxygen free high conductivity copper for the product-line material of a signal system in addition through which a signal flows, or splicing fittings.

The protection network which detects the bads of an overload, a middle point voltage, and also supply voltage is adopted.
Thereby, when a middle point voltage carries out an unusual transition according to the outage of short-circuit of a speaker termination etc., a speaker and power amplifier are separated in an instant.
Moreover, at the time of on/off of a power switch, it operates as a muting circuit.

The light emitting diode window indicator of 20 points by a microcomputer is adopted as the power indicator of a whole surface panel. Peak value is directed without a range change even for 0.001W to a maximum of 100W using a logarithmic comression circuitry.
Moreover, it has a peek hold facility and reading of peak value is also possible.

The large capacity power supply cord insulated doubly is adopted as a power cord.
Furthermore, since the polarity is unified from a power-cord core line to the internal circuitry of C-Z1 and M-Z1, AC line and a polar matching can be aimed at.

The pin plug code has adopted the star-quad structure which used oxygen free high conductivity copper for the material. Thereby, the self-inductance of the code was reduced and the flat transmission characteristics has been acquired to the high region by the low loss.

Glass Glasscase The

Rating of a mode
Form Unreturned monophonic power amplifier
Effective output (20Hz - 20kHz) 60W (8ohm)
Input sensitivity/impedance Input: 1V/50kohm
Output-terminal Speaker: 8ohm
Dumping factor
(20Hz - 20kHz, 8ohm)
80 or more
Supply voltage AC100V, 50Hz/60Hz
Power consumption 220W (Electrical Appliance and Material Control Law)
AC outlet Power-switch un-interlocking.: One line, 100W
Dimensions Width 220x height 185x depth of 440mm
Weight 19.1kg