||PMA-1090: 99,000yen(around the 1992 time)
PMA-1090G:106,000yen(around the 1992 time)
Mos Super optical Integrated Amplifier which adopted the ClassA circuit.
In order to pull out the Oide power capability of a power transistor,
the large-sized toroidal transformer is adopted as a power-source part.
Unlike the conventional transformer, a toroidal transformer is what wound
the coil around the doughnut-like ring core, and has the characteristic
excellent in fields, such as a stable supply of current, and prevention of the
leakage flux and vibration.
The MOS super optical Class A circuit which
added MOS-FET to the new super optical Class A circuit is adopted as a power
The invar テッド Darlington driver who equipped the driver
stage with MOS-FET and a bipolar transistor,It has become possible to make the
bias current sent through a driver stage increase by leaps and bounds, the
Class-A working range could be expanded, and about the same quality as Class-A
operation is secured by the new optical Class A circuit also at the time of the
The independent composition of a preamplifier part and a
power amplifier part is adopted.
It has the separate composition of having
begun the power transformer and having made all the circuits, such as a power
supply circuit, separating, the mutual intervention for every block by the
electromagnetic waves from large current is suppressed, and operation and
high-quality-sound-izing which were stabilized more are attained.
Moreover, a power amplifier part is having circuit composition which made Lch and Rch
become independent, and also has eliminated the influence of mutual.
In order to reduce the bad influence to the signal by wiring material or
wiring, shortest-ization of the signal course reached to an input terminal
-> speaker terminal is attained.
The low impedance volume control which
raises the S/N ratio in a listening level is adopted.
CD balance input
It is possible to carry the Source-Direct switch and to
bypass control circuits, such as tone control, balance, a loudness, and a
subsonic speed, in the state of on.
The phone selector which does not
choose the cartridge of MM/MC is carried.
There were two kinds, PMA-1090
of black calla and PMA-1090G of the gold-collar with side wood.
|<Power amplifier part>
|Output power (20Hz - 20kHz)
||0.004% (1kHz, 75W, 8ohm)
|A dynamic characteristic / dynamic power
||5Hz - 50kHz (Output 75W, 0.03%, 8ohms)
|Line-in frequency response
||4Hz-150kHz+0 -3 dB (outputs 8ohm and 1W)
||AorB: 6ohms - 16ohms
|Headphone maximum except take-off
||Phono MM: 2.5mV/47kohm
Tape1, 2, CD, Tuner, Aux:150mV/47kohm (Source Direct off)
Tape1, 2, CD, Tuner, Aux:150mV/10kohm (Source Direct on)
|The maximum except take-off/Output power
||0.001% (1kHz, 1V)
|Signal to noise ratio
(the auditory sensation weighting A, input short circuit)
|Phono MM: 95dB (at the time of a 5mV input)
Phono MC: 77dB (at the time of a 0.5mV input)
Line input: 110dB (at the
time of Source Direct on)
|Tone control characteristic
||Bass: ±8dB (100Hz)
Treble: ±8dB (10kHz)
||16Hz, -12 dB/oct
|Loudness control characteristic
|Power supply voltage
|Dimensions (a base, a knob, terminal included. )
||PMA-1090: Width 434x height 185x depth of
PMA-1090G: Width 470x height 186x depth of 438mm