|49,800yen(around the 1980 time)
The Integrated Amplifier which adopted 2 amplifier composition of super
equalizer amplifier and power amplifier.
Basic composition is considered
as 2 amplifier composition of only the MC/MM super equalizer amplifier carried
by PMA-550/PMA-540, and non switching A power amplifier, supplies the technology
of DENON, and is raising completeness.
The direct direct-current servo
system which banished the coupling capacitor leading to sound quality
degradation is adopted.
The signal course serves as a Capacitor-Less design, and even SP output terminal does not have a coupling capacitor which affects sound quality from MC input terminal.
The equalizer amplifier part
carries the super equalizer which consisted of the NF form direct-current
amplifier and CR form equalizing filters by low noise dual FET, and has realized
Moreover, in order to demonstrate the merit of a
super equalizer, a focus is united with MC cartridge also with a gain and S/N, and it is designed.
The non switching A system which carries a zero
crossing linear bias circuit is adopted as a power amplifier part.
In a zero
crossing linear bias circuit, it is carrying a high speed thermal feedback
circuit,While developing the merit of non switching further and attaining
stabilization of speedy bias from the time of a power-source injection, high
stability is acquired also to external factors, such as a temperature change and
The active device and the mass capacitor carry the
real-time tone control circuit by which it is not placed between signal courses
in the tone control part.
In this circuit, wide-range and smooth control is
enabled with the technique of including a passive device in the return system of
Making direct connection all the input-and-output
terminals with a printed circuit board, an input-and-output change is making it
operate with the aluminum shaft of a nonmagnetic material, and is suppressing
leading about of wires to the minimum.
The REC-OUT OFF function is
carried in consideration of the influence on sound quality.
Subsonic Filter and loudness control are carried.
|<Power amplifier part (Tuner in->SP
(both channel drive, a sine wave continuation output, 20Hz - 20kHz)
|THD (20Hz - 20kHz, Output-power-3dB)
||0.009% or less
|Cross modulation distortion
(an equivalent for 60Hz:7kHz=4:1 and an Output power)
|0.004% or less (at the time of 25W
equivalent amplitude output)
|Output bandwidth (IHF, both ch(es) drive)
||5Hz - 80kHz (THD0.1%)
|Frequency response (at the time of 1W
||4Hz-150kHz+0 -3 dB
|Output load impedance (1kHz)
||AorB: 4ohms - 16ohms
|<Preamplifier part (Input
sensitivity/impedance is removed and it is Phono in->Rec out)>
||Phono MM: 2.5mV/50kohm
Tuner, AUX, Tape:150mV/40kohm
|The maximum except take-off/Output power
|RIAA deflection (MM, MC)
|THD (at the time of 1kHz and 6V output)
||0.002% or less
|Signal to noise ratio (IHF-A, input short
||Phono MM: 86dB (at the time of a 2.5mV
Phono MC: 70dB (at the time of a 0.25mV input)
Tuner, AUX, Tape:
||Bass: ±8dB (100Hz)
Treble: ±8dB (10kHz)
||18Hz, 6 dB/oct
||100Hz : +7.5dB, 10kHz : +7.5dB
|Power supply voltage
|Power consumption (Electrical Appliance and
Material Control Law)
||Width 434x height 112x depth of 390mm