ONKYO Integra A-711/150
¥ 200,000 (around 1973)
¥ 220,000 (around 1974)
Commentary
This pre-main amplifier achieves clear sound quality by improving linearity at low output, which was a weak point of conventional high power amplifiers, and removing higher harmonic components included in distortion.
By setting the current of the power transistor to a large value of 300 mA when there is no signal, the linearity at small outputs from 0W to 1.5W is improved. At medium outputs or higher power, a total of eight transistors are built in to compensate for linearity and reduce distortion, which is said to be easily audible.
This combines the power of a large output amplifier with the delicate sound quality of a small output.
It has a unique design with an input terminal mounted on the top panel.
Model Rating
Type | Pre-main amplifier |
Power Amplifier Unit | |
Circuit system | Special Pure Con All Stages Connected D&D |
Rated Output (1 kHz) | 8 Ω : 75W + 75W 4 Ω : 100W + 100W |
Dynamic Power (IFF8 Ω) | 200W |
Total harmonic distortion rate (1 kHz) | 0.03% or Less (Rated Output) 0.03% or less (at 10W output) |
Power Band With (IHF, -3dB, THD 0.2%) | 10 Hz to 100 kHz |
Signal-to-noise ratio (IHF A network) | 110dB |
Damping Factor (DC ~ 20 kHz, 8 Ω) | 80 |
Load impedance | 4 Ω ~ 16 Ω |
Rated input voltage / impedance (10 Hz to 50 kHz) |
1V/100k Ω |
Gain | 28.5dB |
Preamplifier Section | |
Input Sensitivity / Impedance | Phono : 1.2, 2.4, 4.8mV/50k Ω Tuner, AUX, Play : 100mV/100k Ω |
Total Harmonic Distortion Factor (1 v, 1 khz) | Not more than 0.03% |
RIAA deviation | Within ± 0.5 dB |
Maximum allowable input (at 1kHz/10kHz, input sensitivity of 2.4 mV) |
RMS:350mV/1.7V P-P:990mV/4.8V |
S/N (IHF A network) | Phono1, 2 : 75 dB Tuner, AUX, Play : 90 dB |
Tone Control (2 db Step Type) | Bass : ± 10 dB (100 Hz, F.S. 400 Hz) Treble : ± 10 dB (10 kHz, F.S. 2 kHz) |
Turnover frequency | Bass : 125 Hz, 400 Hz Treble : 2 kHz, 8 kHz |
Filter | High : 5 kHz, 20 kHz, 12dB/oct. Low : 10 Hz, 30 Hz, 12dB/oct. |
<General> | |
External dimensions | Width 490x Height 182x Depth 460 mm |
Weight | 24.5kg |