Audio Database

The pictorial image of Integra A-820RS

ONKYO Integra A-820RS
175,000yen(1983 release)

Description
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The Integrated Amplifier of RS series most significant which aimed at the full-scale correspondence to the digital source by adopting a super turbo scheme.

A super turbo scheme is a scheme of dividing into a pure electric the power transformer which generates a harmful modulation-noise component inside amplifier with an amplification part, and has expanded the dynamic dynamic range by 20dB.
By this scheme, when a low sound signal of 100Hz or less is inputted into amplifier, the delta turbo circuitry is used for the noise made from the unbalance of } to a power source, and it has prevented using a turbo filter circuit to what is generated with the size of a signal.

The original super servo integral scheme of Onkyo is adopted.
By this scheme, cross modulation distortion generated because the electromotive force induced by the speaker has a time lag and flows into an output stage according to external factors, such as sound pressure of other channels, is banished thoroughly.
Moreover, while applying a servo feedback to the input side from the both ends of output side + of amplifier, and - and cutting especially the harmful noise component in extremely low frequency, the noise component produced in the impedance which various kinds of resisted parts in an earth line accumulated is stopped.

In order to amplify complicated music signal wave type faithfully, the implementation of a simple structure is aimed at, and it has a straight high gain equalizer corresponding to MC, and 2 amplifier stream compositions of only a power part, and the direct tone is adopted also about the tone control circuit.
Affecting a tone quality not using tone amplifier is the scheme which consisted of only little passive element, and even if it does not carry out the tone defeat of the direct tone, it makes the quality tone quality possible.

When it connects with equipments, such as the low special-NetWare-program source and the cartridge in which a quality is extremely bad of grade, and a speaker system, extremely, the softness circuitry which make it easy to control resolution and to hear is carried.

In order to prevent the oscillation from the outside, the super stabilizer is formed as a special structure reinforcing material.

Linear switching which suppresses crossover distortion by raising the linearity of a circuit operation without changing the bias which Onkyo was original and developed is adopted as a power amplifier part,An operation of a circuitry can be brought close to a Class-A in respect of a tone quality, though it is B class.
Furthermore, the influence of switching distortion is suppressed by using of the High fT power transistor.

The non-magnetic-material chassis is used for the main parts of a chassis, and the occurrence of a harmful high order higher harmonic is reduced.

In A-820RS, the large-scale completeness 2 transformer scheme is adopted.

Internal

Rating of a mode
Form Stereo Integrated Amplifier
Output power (20Hz - 20kHz) 120W+120W (AUX->SP Out, 8 ohm, both channel drive)
THD (20Hz - 20kHz) 0.007% (at the time of AUX->SP Out and an Output power)
0.005% (at the time of AUX->SP Out, 1 / 2 output)
0.003% (Phono man month->Rec Out, 3V)
0.01% (Phono MC->Rec Out, 3V)
Cross modulation distortion 0.004% (AUX->SP Out)
Power Band Width 5Hz - 100kHz (IHF, 3dB, THD 0.2%)
Dumping factor 100 (1kHz, 8ohm)
Frequency characteristic Phono->Rec Out: 20Hz-20kHz}0.2dB (RIAA deflection)
AUX->SP Out: 2Hz-100kHz+0 -3dB
Input sensitivity/impedance Phono man month: 2.5mV / 47kohm, 100kohm
Phono High MC: 2.5mV/100 ohm
Phono MC: 150 microvolts/100ohm, 220ohm
compact disk, Tuner, AUX, Tape Play:150mV /, 47kohm
Phono maximum permissible input
(1kHz/10 kHz, 0.05%)
Phono MM:300mV/1400mV
Phono High MC:300mV/1400mV
Phono MC:19mV/90mV
An Output voltage/impedance Tape Rec: 150mV/560 ohm
Pre Out: 1.5V/600 ohm
S/N ratio (IHF short) Phono MM:88dB
Phono MC:70dB
compact disk, Tuner, AUX, Tape Play: 100dB
Tone control (Vol-16dB) Bass: }8dB (70Hz)
Treble: }8dB (20kHz)
Loudness + 4dB, +6dB (100Hz)
Subsonic Filter 15Hz, 6dB / oct
Muting -20dB
Power source AC100V, 50Hz/60Hz
Power consumption 210W (Electrical Appliance and Material Control Law specification)
AC outlet unswitched: One piece (200W)
switched: Two pieces (total 200W)
Dimensions Width 471x height 175x depth of 431mm
Weight 23kg