Audio Database

The

DENON PMA-1090 PMA-1090: 99,000yen(around the 1992 time)
PMA-1090G:106,000yen(around the 1992 time)

Description
 
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 amplifier part.
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 Taishin number.

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 is carried.

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.

The Internal
Rear

Rating of a mode
Form Integrated Amplifier
<Power amplifier part>
Output power (20Hz - 20kHz) 180W+180W (6ohms)
150W+150W (8ohms)
THD 0.004% (1kHz, 75W, 8ohm)
A dynamic characteristic / dynamic power 450W (2ohms)
350W (4ohms)
Output bandwidth 5Hz - 50kHz (Output 75W, 0.03%, 8ohms)
Line-in frequency response 4Hz-150kHz+0 -3 dB (outputs 8ohm and 1W)
Output terminal AorB: 6ohms - 16ohms
A+B: 12ohm-16ohm
Headphone maximum except take-off 48mW (8ohms)
<Preamplifier part>
Input sensitivity/impedance Phono MM: 2.5mV/47kohm
Phono MC: 0.2mV/100 ohms
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 10V/150mV
THD 0.001% (1kHz, 1V)
RIAA deflection 20Hz-50kHz±0.3dB
<Synthesis>
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)
Subsonic Filter 16Hz, -12 dB/oct
Loudness control characteristic +7dB(100Hz)
+6dB(10kHz)
Power supply voltage AC100V, 50Hz/60Hz
Power consumption 250W
Dimensions (a base, a knob, terminal included. ) PMA-1090: Width 434x height 185x depth of 438mm
PMA-1090G: Width 470x height 186x depth of 438mm
Weight PMA-1090:17.5kg
PMA-1090G:19.0kg