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DENON PMA 780D

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The

DENON PMA-780D  
(around the 1987 time)

Description
 
A digital multi-interface circuit is carried in a core, and it is an Integrated Amplifier corresponding to a digital output. 

A 400VA rank and a 6.2kg large-sized EI transformer are carried in the power transformer. 
The commutator of surge current 200A/200V is adopted as rectification, and in order to acquire mighty output current, a total of 32,800 micro F of electrolytic condensers is carried. 
With two kinds of electrolytic condensers from which a tongue delta differs by 2-2 system which is the feature of a pure dynamic power source, the electrolytic capacitor intercepted the power-source noise and has acquired the energy electric supply capability for purity to be high. 

Super unreturned amplifier original with DENON is adopted as a power amplifier part. 
As for this amplifier, the flow of an audio signal has simple circuit composition of only one way. Moreover, the high-speed operational amplifier detected the distorted ingredient by active devices, such as a transistor, and it has removed only the distorted ingredient. 
Moreover, static distortion (higher-harmonic-wave distortion, intermodulation distortion) is negated theoretically, and it has become a circuit where the stability which does not generate dynamic distortion (transient distortion) is high. 
The final stage is using the power transistor of fT20 MHz-Pc 150W by single push, and has acquired the linear magnification characteristic from the minimum volume time till the amount of Oto. 
The voltage magnification stage adopted three steps of differential amplification, the first rank adopted low noise FET very much, noise[ low ]-izing and direct-current composition-ization were achieved, and good matching with an electric power magnification stage is secured by the final stage of a push pull circuit. 
Moreover, the ±350v[/micro ] sec high slew rate is gained between CD input ->SP terminals by adoption of the new current mirror circuit of the fT20MHz high-speed transistor use excellent in the high region characteristic etc. 

In order to correspond to a digital output, the digital multi-interface is carried. 
The digital multi-interface part consists of an "interface circuit" and a "D/A converter circuit." 
An interface circuit carries out discernment correspondence of the sampling frequency automatically, and also carries the "straight line phase digital filter." 
Moreover, the right-and-left channel independent "W super linear converter" system is used for a D/A converter circuit. In order that this may use 2 sets of D/A converters, it does not have a conversion error at the time of the Dainyuu power, either, a channel separation is excellent, and it does not have a right-and-left channel time lag, either. 

The interface circuit and the D/A converter circuit were constituted in the separate wiring board, the meantime was shielded, and interference of the digital signal which becomes noise for an analog signal is prevented by preparing the exclusive power source made to become independent of a secondary transformer side in an interface circuit. 
Furthermore, since the whole is covered with the shielding case which serves as vibrationproofing of a chassis or a wiring board, it is stopping that a digital noise leaks to other portions. 

The Source-Direct switch is carried, when it is used, a control part is canceled completely, and all the input sauce is directly linked with power amplifier. 

The equalizer amplifier which constituted the first rank from uncanny low noise FET differential amplification is carried. 

Three tape inputs are equipped and recording is also possible apart from a speaker play by a Rec Out selector. 

The analog input system has equipped the processor loop printer which can utilize sound creative apparatus, such as a surround processor and a graphic equalizer. 

Top covering is used as an eight-point stop, and it is made the main chassis with the direct stop. 
By fully considering a suitable setup of each dimension, each screw stop position, and arrangement of an insulator, a bottom chassis improves the reduction effect of vibration and is distributing the mode of vibration while making it into a transformer part and the two-sheet structure of dividing others. 

The Subsonic Filter is carried only in Phono. 

The reset type high-speed protection circuit of an establishment meter is carried. 

Rear
Internal

Rating of a mode
Form Stereo Integrated Amplifier
<Power amplifier part>
Output power (20Hz - 20kHz) 110W+110W (8ohms) 
130W+130W (6ohms)
Input sensitivity/impedance Processor loop input: 150mV/47kohm
THD 0.004% (20Hz - 20kHz, 55W, 8ohm)
Cross modulation distortion 0.003% (an equivalent for 110W, 8ohms)
Dynamic power 350W/2 ohm
TIM distortion Below measurement full limits
Slew rate ±350v/microsec
Output bandwidth 5Hz - 100kHz (55W, 0.5%, 8ohms)
Line-in frequency 4Hz - 150kHz, and +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: 430mW (8ohms), 8-400-ohm conformity
<A digital interface / the DAC section>
A digital input level / impedance 0.5 Vp-p/75ohm same axle
Frequency response (0dB) 5Hz-20kHz±0.3dB
Signal to noise ratio (dB for zero, 1kHz) 105dB
Dynamic range (1kHz) 96dB
THD (0dB, 1kHz) 0.0025%
Channel separation (0dB, 1kHz) 100dB
<Preamplifier part>
Input sensitivity/impedance Phono MM: 2.5mV/47kohm 
Phono MC: 0.2mV/100 ohms 
CD, AUX, Tuner, Tape1, 2, 3(DAT):150mV/47kohm
The maximum except take-off/Output power 
(processor loop included about an output.)
8V/150mV
THD (processor loop included about an output) 0.002% (1kHz, 8V)
Equalizer (RIAA) deflection 20Hz-100kHz±0.3dB (MC IN - processor loop 出力含)
<Synthesis>
Signal to noise ratio
(an input short circuit, the auditory sensation weighting A)
Phono MM:88dB 
Phono MC: 69dB (at the time of a 0.25mV input) 
CD, AUX, Tuner, Tape1, 2, 3 (DAT):108dB
Tone control characteristic Bass: ±8dB (100Hz) 
Treble: ±8dB (10kHz)
The Subsonic Filter for Phono 16Hz, -12 dB/oct
Loudness control characteristic Low-pass: +4dB (100Hz) 
High region: +4dB (10kHz)
Muting switch -20dB
Power consumption 
(Electrical Appliance and Material Control Law)
216W
Power source AC100V, 50Hz/60Hz
Dimensions
(it is an included about a foot, a knob, a terminal, etc.)
Width 434x height 172x depth of 396mm
Weight 15.6kg
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