Audio Database

The

DENON PMA-1010D
178,000yen(around the 1987 time)

Description
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The pure Class-A Integrated Amplifier which built in the D/A converter.

He is conscious also of the quality at the time of small power, and it has become Class-A magnification up to 1W output (8ohms).
As for Class-A push pull operation, there is little distortion, the ripple of the zero crossing neighborhood of sy copy power current through which it flows into transistor of one of the two is not pulse-like, and since it becomes continuously, transitional / secondary accident does not produce it not only in an electric target but in mechanical vibration, such as a transistor and a heat sink.

In order to correspond to the rise in heat of Class-A magnification, the fin of a heat sink is doubled, heat conduction unites a block firmly on both sides of the good quick copper plate of oscillating attenuation, and it is planning high heat resistance and no resonating.

A power stage is a parallel push pull of the power transistor of Pc130W, and has original super unreturned composition.

A large-sized power transformer, the fast recovery diode of high-speed rectification, the 48,000-micro F electrolytic condenser for audios, etc. are adopted as a power-source part.
Stabilization is attained by adoption of the balanced type electric supply system floating power source.
Moreover, the large-sized heat sink has separated the power-source part and the main signal system.

The Phono equalizer corresponding to MC/MM is carried.
The first rank is the equalizer direct-current amplifier which connected the differential amplification by low-noise FET parallel, and has also strengthened the power source.
Moreover, the Subsonic Filter only for Phono is also carried.

4DA push pull super linear converter is adopted as a D/A converter.
This converter carries out the work to which the D/A converter of every two right-and-left channels selected carefully resembled the Class-A push pull, respectively,Furthermore, it consists of 4 time oversampling digital filter, sampling hold-circuit, and 7th LC-OFCC.A.L.P. (straight line phase) low pass filters.

A digital input part equips the digital input selector by three coaxial digital inputs, those with two optical digital inputs, and a high-speed C-MOS logic circuit, identifies CD-DAT-DBS automatically, and transmits it to a D/A converter.
Moreover, in order to lose interference with a converter part, the "Opto-isolated" system by optical combination is adopted.


The digital interface circuit and the D/A converter circuit were constituted in the separate wiring board, and the meantime is shielded.
The exclusive power source made to become independent of a secondary transformer side was prepared in the interface circuit, and interference of the digital signal which serves as a lower person of the noise of an analog signal is prevented.
The whole was covered with the shielding case which serves as vibrationproofing of a chassis or a wiring board, and has prevented that a digital signal leaks to other analog input units, a control part, and a power amplifier part.

The digital output is carried.

All the input sauce was directly linked with power amplifier, and the Source-Direct switch which can carry out "perfect direct-current-ization" is adopted.

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

Broadband real-time tone control is carried.

A power cord with a polar display.

Composition
Distribution
Internal Large-sized

Rating of a mode
Form Digital multi-interface loading Integrated Amplifier
<Power amplifier part>
Output power (20Hz - 20kHz) 140W+140W (8ohms)
170W+170W (6ohms)
Input sensitivity/impedance Processor loop input: 150mV/47kohm
THD 0.003% (20Hz - 20kHz, 70W, 8ohm)
Cross modulation distortion 0.002% (an equivalent for 140W, 8ohms)
Dynamic power 670W (2 ohms, below TIM distortion measurement full limits,
and more than slew-rate}350v/microsecond)
Output bandwidth 5Hz - 100kHz (Output 70W, 0.5%, 8ohms)
Line-in frequency response 1Hz - 150kHz, and +0 -3dB (1W, 8ohm)
Output load impedance 0.1ohm or less
Output terminal Speaker: AorB:6-16ohm, A+B:12-16ohm
(B terminal is a direct connection)
Headset-jack maximum except take-off: 550mW (8ohms), 8-400-ohm conformity
<An interface / the DAC section>
A digital-input/output level / impedance Same axle: 0.5 Vp-p/75ohms
Standard light input: Two lines
Frequency response (0dB) 5Hz-20kHz}0.2dB
Signal to noise ratio (dB for zero, 1kHz) 108dB
Dynamic range (1kHz) 97dB
THD (0dB, 1kHz) 0.0023%
Channel separation (0dB, 1kHz) 100dB
<Preamplifier part>
Input sensitivity/impedance Phono MM: 2.5mV/47kohm
Phono MC: 0.2mV/100 ohms
CD, Tuner, AUX, Tape1, 2, 3(DAT, PB):150mV/47kohm
The maximum except take-off/Output power 10V/150mV (Rec Out, Processor Loop Out)
THD (Rec Out, Processor Loop Out) 0.001% (1kHz, 8V)
RIAA deflection 20Hz-100kHz}0.2dB (IN-Rec Out & Processor Loop Out)
<Synthesis>
Signal to noise ratio
(an input short circuit, the auditory sensation weighting A)
Phono MM:90dB
Phono MC: 75dB (at the time of a 0.25mV input)
Line: 110dB (at the time of a 150mV input)
Tone control characteristic Bass: }8dB (100Hz)
Treble: }8dB (10kHz)
The Subsonic Filter for Phono 16Hz, -12 dB/oct
Loudness control characteristic 100Hz:+4dB
10kHz:+4dB
Muting switch -20dB
Power consumption 323W
Power source AC100V, 50Hz/60Hz
Dimensions
(it is an included about a foot, a knob, a terminal, etc.)
Width 474x height 174x depth of 396mm
Pleuron thickness: 20mmx2
Weight 22kg