The Integrated Amplifier which attained high-quality sound-ization by loading of
a toroidal transformer or adoption of the New super optical ClassA circuit.
The NEW super optical ClassA circuit which is the specific technology of
DENON is carried in the power amplifier part.
By the newly developed bias
control circuit, magnification operation was carried out as a pure Class-A to
the general listening power level, and sound quality of a Class-A no one but is
realized. Moreover, the optical element was used for transmission of the control
signal sent to a bias circuit from a bias control circuit, and the main signal
system and an interference mutual [ between bias controlling circuits ] are
completely eliminated to it.
By adopting a toroidal transformer and a
large-sized electrolytic condenser, momentary response power is raised to the
The signal course on either side was made into the shortest, and also the
chassis construction made to separate is adopted.
In PMA-690, the power amplifier part and the
preamplifier part were symmetrically divided into right and left, respectively, and the magnetic flux of a power-source part lock has prevented jumping into
other Brock thoroughly.
In order to eliminate an unnecessary functional
circuit as much as possible in sound, shortest-ization of the signal course
reached from an input terminal to a speaker terminal is attained. This performed
switch and proper arrangement of volume and shortening of a large distance is
In order to improve the S/N ratio in a listening level, low
impedance volume control is adopted.
By Rec out Selector, the recording
of the sauce which is not related to a speaker output is possible.
The Source Direct is carried and, in on, control circuits, such as Bass/Treble/Balance/Loudness/Sub
sonic, are bypassed.
Phono Selector which does not choose the cartridge of MM/MC is carried.
|<Power amplifier part>
|Output power (20Hz - 20kHz)
|A dynamic characteristic / dynamic power
||0.004% (1kHz, 52.5W, 8ohm)
||5Hz - 50kHz (Outputs 52.5W and 8ohm, 0.03%)
|Line-in frequency response
||4Hz-150kHz+0 -3 dB (outputs 1W and 8ohm)
|Speaker output terminal
||AorB: 6ohms - 16ohms
|Headphone maximum except take-off
||Phono MM: 2.5mV/47kohm
Tape1, 2, CD, Tuner, Aux:150mV/47kohm (at the time of sauce
Tape1, 2, CD, Tuner, Aux:150mV/10kohm (at the time of sauce
|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: 94dB (at the time of a 5mV input)
Phono MC: 75dB (at the time of a 0.5mV input)
Line input: 110dB (at the
time of sauce direct-on)
|Tone control characteristic
||Bass: ±8dB (100Hz)
Treble: ±8dB (10kHz)
||16Hz, -12 dB/oct
|Power supply voltage
|Dimensions (a base, a knob, a terminal
||Width 434x height 160x depth of 398mm