Audio Database

The

DENON PMA-590
59,800yen(1990 release)

Description
 
The Integrated Amplifier which carries an optical Class A circuit.

The optical Class A circuit is adopted, a power amplifier part is made to amplify a musical average level as a pure Class-A, and it is amplifying in it using the non switching Class-A system which has an effect in the improvement of crossover distortion or switching distortion at the time of the Oide power.
Control of the magnification system by the size of an input level,It is a thing which the newly developed bias control circuit is carrying out and will make an optical element transfer of the control signal from this bias control circuit to a power transistor bias circuit and to do,While eliminating completely the main signal system and an interference mutual [ between bias controlling circuits ], high speed-ization of bias control is realized.

The large-sized power transformer is adopted as a power-source part, and the electrolytic condenser of 8,200 micro Fx4 is carried in the block capacitor.

Buffer amplifier is carried in the preceding paragraph of volume control, the impedance of a volume control circuit is lowered, and improvement in the signal to noise ratio at the time of real use is aimed at.
Furthermore, improvement in the separation between right-and-left channels and between functions is realized.

The CD Direct terminal is carried and the high play of direct sending and purity is enabled for the signal from CD player to power amplifier only by the change of the selector switch.

The processor loop function in which a graphic equalizer, a surround processor, etc. are connectable is carried.

The equalizer amplifier in which a MC/MM change is possible is carried.

The by bracelet plate of the 3 total structure which sandwiched the macromolecule sheet with the sheet steel of two sheets is added to the usual bottom chassis, the sheet steel of one more sheet is further put on it, and the rigidity of the chassis is sharply improved to it.
Furthermore, vibration is absorbed by top covering damper material, resonance is suppressed, and high rigidity-ization is attained.

Functions, such as tone control with a tone defeat, loudness control, and a Subsonic Filter, are carried.

The reset type high-speed protection circuit is adopted.


Rating of a mode
Form Integrated Amplifier
<Power amplifier part>
Output power (20Hz - 20kHz) 115W+115W (6ohms)
95W+95W (8ohms)
Input sensitivity/impedance Processor loop input: 150mV/15kohm
THD 0.05% (20Hz - 20kHz, 48W, 8ohm)
A dynamic characteristic / dynamic power 270W (2ohms)
Output bandwidth 5Hz - 50kHz (Output 48W, 0.5%, 8ohms)
Line-in frequency response 4Hz-100kHz+0 -3dB (1W, 8ohm)
Output load impedance 0.1ohm or less
Output terminal Speaker: AorB:6-16ohm, A+B:12-16ohm
Headset-jack maximum except take-off: 390mW (8ohms), 8-400-ohm conformity
<Preamplifier part>
Input sensitivity/impedance Phono MM: 2.5mV/47kohm
Phono MC: 0.25mV/100 ohms
CD, Tuner, Aux1, 2:150mV/47kohm
CD Direct, Tape1, 2:150mV/10kohm
The maximum except take-off/Output power 10V/150mV
THD 0.003% (Rec out & Processor Loop out, 1kHz, 1V)
RIAA deflection 20Hz-50kHz±0.3dB (MC-Rec out & Processor Loop out)
<Synthesis>
Signal to noise ratio
(an input short circuit, the auditory sensation weighting A)
Phono MM:82dB
Phono MC: 62dB (at the time of a 0.25mV input)
CD, Tuner, Aux1, 2:103dB
CD Direct, Tape1, 2:106dB
Tone control characteristic Bass: ±10dB (100Hz)
Treble: ±10dB (10kHz)
Subsonic Filter 16Hz, -12 dB/oct
Loudness control characteristic 100Hz:+8dB
10kHz:+7dB
Power supply voltage AC100V, 50Hz/60Hz
Power consumption 175W
Dimensions
(it is an included about a base, a knob, and a terminal)
Width 434x height 145x depth of 363mm
Weight 15kg