The ONKYO Integra A-820RS is a timeless gem from the 1980s. This integrated amplifier brought unparalleled sound quality and power to music enthusiasts around the world. With its sleek design and robust build, it provided a reliable and immersive audio experience.
Featuring innovative technology and high-quality components, the A-820RS delivered rich and detailed sound reproduction while minimizing distortion. Its 100-watt output ensured enough power to drive even the most demanding speakers, creating a truly captivating listening experience.
Though decades have passed, the ONKYO Integra A-820RS remains a revered piece of audio equipment, cherished by audiophiles who appreciate its unique vintage charm and superb performance..
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ONKYO Integra A-820RS
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¥ 175,000 (released in 1983)
Commentary
The RS series top-of-the-line pre-main amplifier is fully compatible with digital sources by adopting the super turbo system.
In the Super Turbo system, the power transformer, which generates harmful modulation noise components inside the amplifier, is separated from the amplifier purely electrically. This system extends the dynamic dynamic range by 20 dB.
In this system, when a low audio signal of 100 Hz or less is input to the amplifier, noise caused by ± imbalance in the power supply is prevented by using a delta turbo circuit, and noise caused by signal magnitude is prevented by using a turbo filter circuit.
Onkyo’s unique super servo integral system is adopted.
This method completely eliminates intermodulation distortion that occurs when the electromotive force induced in the speaker flows into the output stage with a time lag due to external factors such as the sound pressure of other channels.
In addition, servo feedback is applied to the input side from both the + and – sides of the output side of the amplifier, and harmful noise components especially at very low frequencies are cut off, and noise components generated in the impedance accumulated by various resistance components in the ground line are suppressed.
In order to faithfully amplify complex music signal waveforms, a simple structure has been realized. It consists of a straight high-gain equalizer for MC and a two amplifier configuration with only the power section. The tone control circuit also uses direct tone.
Direct Tone does not use a tone amplifier and is composed only of passive elements that have little effect on sound quality. It enables high quality sound without tone degradation.
It is equipped with a soft circuit that controls the resolution and makes it easier to listen when connected to extremely low-grade program sources or devices such as extremely low-quality cartridges or speaker systems.
In order to prevent vibration from the outside, a super stabilizer is installed as a special structural reinforcement.
The power amplifier uses a linear switching method developed by Onkyo, which reduces crossover distortion by improving the linearity of the circuit operation without changing the bias. Although the operation of the circuit is class B, the sound quality is close to class A.
In additionTBy using a power transistor, the effect of switching distortion is suppressed.
Non-magnetic chassis is used for the main parts of the chassis to reduce the generation of harmful high-order harmonics.
The A-820RS uses a large complete 2-transformer system.
Model Rating
| Type | Stereo pre-main amplifier |
| Rated Output (20 Hz ~ 20 kHz) | 120W + 120W (AUX → SP Out, 8 Ω, both channel drive) |
| Total harmonic distortion rate (20 Hz to 20 kHz) | 0.007% (AUX → SP Out, at rated output) 0.005% (AUX → SP Out at 1/2 output) 0.003% (Phono MM → Rec Out, 3 V) 0.01% (Phono MC → Rec Out, 3 V) |
| Cross modulation distortion factor | 0.004% (AUX → SP Out) |
| Powerbandwidth | 5 Hz ~ 100 kHz (IHF / 3 dB, THD 0.2%) |
| Damping factor | 100 (1 kHz, 8 Ω) |
| Frequency characteristic | Phono → Rec Out : 20 Hz to 20 kHz ± 0.2 dB (RIAA deviation) AUX → SP Out : 2 Hz ~ 100 kHz + 0 -3dB |
| Input Sensitivity / Impedance | Phono MM : 2.5mV/47k Ω, 100k Ω Phono High MC : 2.5mV/100 Ω Phono MC : 150 μ V/100 Ω, 220 Ω CD, Tuner, AUX, Tape Play : 150mV/47k Ω |
| Phono maximum allowable input (1kHz/10kHz, 0.05%) |
Phono MM:300mV/1400mV Phono High MC:300mV/1400mV Phono MC:19mV/90mV |
| Output Voltage / Impedance | Tape Rec : 150mV/560 Ω Pre Out : 1.5V/600 Ω |
| S/N ratio (IHF short) | Phono MM:88dB Phono MC:70dB CD, Tuner, AUX, Tape Play : 100 dB |
| Tone Control (Vol-16dB) | Bass : ± 8 dB (70 Hz) Treble : ± 8 dB (20 kHz) |
| Loudness | + 4 dB, + 6 dB (100 Hz) |
| Subsonic filter | 15 Hz, 6dB/oct. |
| Muting | -20dB |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 210W (Electrical Appliance and Material Control Law Standard) |
| AC outlet | Unswitched-1 (200W) Switched : 2 (200W total) |
| External dimensions | Width 471x Height 175x Depth 431 mm |
| Weight | 23kg |
The ONKYO Integra A-820RS is an integrated amplifier that was produced by ONKYO in the 1980s. It was a popular choice among audiophiles during that time and is still highly regarded today.
One of the key features of the A-820RS is its high power output. It offers 100 watts per channel, which provides ample power to drive speakers and deliver a rich and dynamic sound. The amplifier also boasts low distortion levels, which ensures that the audio quality remains pristine even at high volumes.
Another notable feature of the A-820RS is its build quality. It was constructed using high-quality components and materials, which contributed to its robust construction and durability. This amplifier was built to last, and many units from that era are still in optimal working condition.
The A-820RS also offers a range of connectivity options. It has multiple inputs, including phono, CD, and auxiliary inputs, allowing users to connect various audio sources. Additionally, it has outputs for two sets of speakers, giving users the flexibility to connect multiple speaker configurations.
Overall, the ONKYO Integra A-820RS integrated amplifier is a highly regarded product from the 1980s. It delivered high power output, low distortion, and excellent build quality. With its range of connectivity options, it was a versatile choice for audiophiles looking for a powerful and reliable amplifier. Even to this day, the A-820RS remains highly sought after and is considered a classic piece of audio equipment. –
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