Audio Database

The

DENON PMA-680R
46,800yen(around the 1992 time)

Description
 
The Integrated Amplifier which investigated operativity pursuing pure sound quality by a large-sized toroidal transformer, adoption of the new structure SLDC, etc.

The toroidal transformer is adopted as a power-source part.
Unlike the conventional transformer, a toroidal transformer is what wound the coil around the doughnut-like ring core, and has the characteristic excellent in fields, such as a stable supply of current, and prevention of the leakage flux and vibration.

In order to suppress the mutual intervention of each circuit, new structure S.L.D.C. (Signal Level Divided Construction) is adopted.
By dividing the treatment of a signal into the microcomputer block handling Loule Bell Brock, a high-level block, and a digital signal, the electric mutual intervention during each block is suppressed.

By adoption of low impedance volume, the impedance of the volume control circuit was lowered and the S/N ratio in a general listening level and aggravation of the frequency response are prevented.

The equalizer amplifier corresponding to all of the MC/MM cartridge is carried by switchover control.

It is possible to bypass control circuits, such as Bass, Treble, Balance, and Loudness, by carrying the sauce direct switch and turning ON.

The linkage side of AC outlet is interlocked with remote power on/off.

The system remote control which can respond to CD player of DENON, a cassette deck, and a tuner is attached.
Moreover, it is also possible to remove the sound from a speaker with the muting switch of a remote control main part.

Rear

Rating of a mode
Form Integrated Amplifier
<Power amplifier part>
Output power 85W+85W (6 ohms, 1kHz)
65W+65W (8 ohms, 20Hz - 20kHz)
THD 0.008% (1kHz, 32.5W, 8ohm)
A dynamic characteristic / dynamic power 180W+180W (2ohms)
140W+140W (4ohms)
Output bandwidth 5Hz - 40kHz (Output 32.5W, 0.07%, 8ohms)
Line-in frequency response 4Hz-100kHz+0 -3 dB (outputs 8ohm and 1W)
Output terminal AorB: 6ohms - 16ohms
A+B: 12ohm-16ohm
Headphone maximum except take-off 30mW (8ohms)
<Preamplifier part>
Input sensitivity/impedance Phono MM: 2.5mV/47kohm
Phono MC: 0.2mV/100 ohms
CD, Tuner, Aux, DAT/Tape1, 2:150mV/47kohm (sauce direct-off)
CD, Tuner, Aux, DAT/Tape1, 2:150mV/10kohm (sauce direct-on)
The maximum except take-off/Output power 10V/150mV
THD 0.001% (1kHz, 1V)
RIAA deflection 20Hz-20kHz±0.3dB
<Synthesis>
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: 107dB (at the time of sauce direct-on)
Tone control characteristic Bass: ±8dB (100Hz)
Treble: ±8dB (10kHz)
Subsonic Filter 16Hz, -12 dB/oct
Loudness control characteristic +7dB(100Hz)
+6dB(10kHz)
Power supply voltage AC100V, 50Hz/60Hz
Power consumption 250W
Dimensions (a base, a knob, a terminal included) Width 434x height 140x depth of 353mm
Weight 7.8kg
Attachment: Wireless remote control RC-152
Battery UM-3(AA) x2
Dimensions Width 60x height 176x depth of 18mm
Weight 120g (battery included)