KENWOOD KA-5010
¥ 45,400 (around 1988)
Commentary
This pre-main amplifier was developed from fundamental aspects such as construction, circuit and characteristics by returning to the starting point of how the amplifier should be based on the fundamental premise of music reproduction.
The final stage is designed with discrete power transistors to improve the drive performance at low impedance of the speakers.
The power supply section is equipped with a large transformer of 420 VA and an electrolytic capacitor of 10,000 μ Fx2.
A pure signal ground line is used to prevent distortion caused by noise from the power supply part entering the main ground line of the signal amplifier.
In this system, all the power supply ripple and various noise components are led to the speaker terminals by a dedicated ground line, and all the ground lines join together for the first time. This allows only pure signal to flow through the main ground line, which amplifies the signal, enabling pure amplification.
The insulator is a large φ 60 insulator with a special foamed rubber on the floor contact surface.
In addition, a new structure has been adopted for the contact surface between the insulator and the set bottom, and a unique double anti-vibration structure has been adopted to reduce vibration from the outside.
In order to prevent the vibration of the power transformer and power transistor from adversely affecting the printed circuit board, we have replaced the method of directly mounting the power transistor and heat sink with a unique PCB logical floating structure.
Equipped with a source direct circuit that bypasses the tone control, balance control, subsonic filter, etc.
.JPG)
Model Rating
| Type | Integrated amplifier | ||||||
| Amplifier Unit | |||||||
| Rated output (20 Hz to 20 kHz, both channel operation) |
90W + 90W (6 Ω, THD 0.08%) 80W + 80W (8 Ω, THD 0.06%) |
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| Dynamic Power | 210W + 210W (2 Ω) 170W + 170W (4 Ω) 95W + 95W (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) | 240W | ||||||
| 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 | 12kg | ||||||