KENWOOD KA-7010
¥ 63,700 (around 1988)
Commentary
A pre-main amplifier with improved speaker drive performance under low impedance load.
The power supply has a dedicated transformer on the positive side and the negative side respectively.
The power transformer has a large capacity of 420 VA and is equipped with an electrolytic capacitor of 7500 μ Fx4 with a total capacity of 30000 μ F.
A high power transistor of Pc = 200W is used for the output stage of the power amplifier to improve the drive performance under low impedance load.
We have developed and adopted a pure signal ground line to prevent distortion caused by mixing of the music signal and power ground lines.
In this system, the power supply ripple and various noise components are led to the speaker terminals by a dedicated ground line, and all the ground lines are connected so that all the ground lines join together for the first time. As a result, only a pure signal flows through the main ground line that amplifies the signal, enabling pure amplification.
Consideration is given to the internal layout in order to minimize the signal path and eliminate mutual interference between components.
The volume is placed in the center, and the internal layout follows the theory of INPUT → SELECTOR → VOLUME → POWER AMP → SPEAKER.
The EQ amplifier uses ICL high GmFET differential inputs and integrated circuits.
A source direct circuit is mounted.
.JPG)
Model Rating
| Type | Integrated amplifier | ||||||
| Amplifier Unit | |||||||
| Rated output (20 Hz to 20 kHz, both channel operation) |
110W + 110W (6 Ω, THD 0.08%) 100W + 100W (8 Ω, THD 0.06%) |
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| Dynamic Power | 270W + 270W (2 Ω) 200W + 200W (4 Ω) 125W + 125W (8 Ω) |
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| Total Harmonic Distortion Factor (CD, 8 Ω) |
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| Intermodulation distortion factor (60 hz : 7 khz = 4 : 1) | 0.005% (8 Ω at rated output) | ||||||
| Frequency characteristic | 5 Hz ~ 100 kHz + 0 -3dB (Overall (Line → SP)) | ||||||
| Phono RIAA deviation | 20 Hz to 20 kHz ± 0.3 dB | ||||||
| Signal-to-noise ratio |
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| Tone control | Bass : 100 Hz, ± 10 dB Treble : 10 kHz, ± 10 dB |
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| Subsonic filter | 18 Hz, 6dB/oct. | ||||||
| Bus intensifier | 9 dB (20 Hz), 3 dB (100 Hz) | ||||||
| Damping factor | 160(50Hz) | ||||||
| Input Sensitivity / Impedance (at rated output) |
Phono MM : 2.5mV/47k Ω Phono MC : 200 μ V/100 Ω DAT, CD, Tuner, AUX, Tape Play : 150mV/47k Ω |
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| Phono maximum allowable input (Phono → Tape rec) |
MM : 200 mV (1 kHz, THD 0.05%) MC : 15 mv (1 kHz, THD 0.05%) |
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| Output Level / Impedance | Tape Rec : 150mV/220 Ω | ||||||
| <General> | |||||||
| Pwer | 100 VAC, 50Hz/60Hz | ||||||
| Rated power consumption (Electrical Appliance and Material Control Law) | 260W | ||||||
| Power outlet | Power Switch Interlock : 2, 100W Power switch not linked : 1, 440W |
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| External dimensions | Width 440x Height 148x Depth 398 mm | ||||||
| Weight | 15kg | ||||||