ONKYO Integra A-817RX
¥ 79,800 (released in 1984)
Commentary
A pre-main amplifier of the RX series designed for high power with almost the same configuration as the Integra A-815RX.
In the double sensing servo system, in addition to the conventional negative feedback, servo feedback is applied to the input side of the amplifier through the servo amplifier from both the + terminal and - terminal of the speaker.
The servo on the + side cuts out harmful noise components at very low frequencies, and the servo on the - side cancels out distortion and noise components caused by electromotive force in the impedance of the earth line, and controls the - terminal of the speaker precisely.
This makes it possible to drive accurately not only the + terminal but also the - terminal of the speaker.
It uses a simple two amplifier configuration with only an equalizer amplifier and a power amplifier section with a double sensing servo system. Moreover, it uses a unique direct tone system that does not require a tone amplifier to increase the purity of the sound.
Each of the two tape jacks has an independent recording selector. You can record completely different signals using Tape1 and Tape2, or use a deck and a graphic equalizer for equalization recording.
In addition, since the recording selector is equipped with an off position, the deck recording terminal can be completely disconnected from the signal system when recording is not performed.
In order to improve the low impedance capability, the power supply part is strengthened and parallel connection power transistor is adopted.
A charge noise filter is installed to reduce power supply noise.
It employs a linear switching system originally developed by ONKYO, and the crossover distortion is reduced by a special linearity correction circuit applied to the power stage.
In addition, switching distortion is improved by the adoption of high-ft power transistor.
The equalizer amplifier section uses a high-gain equalizer amplifier for low-impedance MC cartridges.
The power cord is a very thick type with polarity indication that is a double insulated low-impedance copper wire.
There are 2 color variations, black and silver.
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Model Rating
| Type | Stereo pre-main amplifier |
| Rated output (20 Hz to 20 kHz, aux → sp out Both channel drive) |
115W + 115W (6 Ω) 100W + 100W (8 Ω) |
| Total harmonic distortion rate (20 Hz to 20 kHz) | Aux → sp out : 0.005% (8 Ω at rated output) Phono MM → rec out : 0.003% (3 V) Phono MC → rec out : 0.015% (3 V) |
| Cross modulation distortion factor | Aux → sp out : 0.004% (at rated output) |
| Powerbandwidth | 5 Hz to 100 kHz (IHF-3dB, THD 0.2%, 8 Ω) |
| Damping factor | 100 (1 kHz, 8 Ω) |
| Frequency characteristic | Phono → rec out (RIAA deviation) : 20 Hz to 20 kHz ± 0.2 dB Aux → sp out : 2 Hz to 100 kHz + 0 -3dB |
| Input Sensitivity / Impedance | Phono MM : 2.5mV/47k Ω Phono MC : 180 μ V/100 Ω, 220 Ω CD, tuner, aux, tape play : 150mV/47k Ω |
| Phono maximum allowable input (1kHz/10kHz, 0.05%) |
phono MM:210mV/1000mV phono MC:15mV/75mV |
| Rated output voltage / impedance | Tape rec1, 2 : 150mV/560 Ω |
| S/N ratio (IHF-A filter input short) | phono MM:87dB phono MC:70dB CD, tuner, aux, tape play : 100 dB |
| Tone Control (Vol-16dB) | Bass : + / - 8 dB Treble : + / - 8 dB |
| Loudness | +6dB(100Hz) |
| Subsonic filter | 15 Hz, 6dB/oct. |
| Muting | -20dB |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption (Electrical Appliance and Material Control Law standard) | 210W |
| AC outlet | Unswitched : 1 line, 200W Switched : 2 systems, total 200W |
| External dimensions | Width 435x Height 148x Depth 391 mm |
| Weight | 12kg |