TRIO KA-7006
¥ 75,000 (released in 1974)
Commentary
Stereo pre-main amplifier with all stages directly connected + pure complimentary service circuit.
The power amplifier consists of an all-stage direct-coupled circuit from the first stage to the last stage without the interstage coupling capacitor, a pure complimentary service circuit using the Darlington method of PNP-NPN for the output stage, and a ± 2 power supply system using the first stage differential-type.
As a result, various characteristics in the low frequency range have been thoroughly improved, and stable output has been obtained over the entire audible frequency range.
A limiter protection circuit is used to protect the transistors, and a relay is used to protect the speakers and prevent shock noise when the power is turned ON/OFF.
When the output terminal is short-circuited, the limiter level is lowered within 100m ・ sec to protect the transistor.
The equalizer uses a 3-stage direct-coupled first stage differential circuit.
The tone control circuit uses a DLOA (dual low-noise operational amplifier).
The DLOA consists of a first stage differential amplifier, a buffer, a 3-stage class A drive, and a pure complimentary service. This realizes a high dynamic range, high input impedance, high power utilization factor, low impedance, and low distortion factor. Shock noise is also suppressed because the DC current at the output terminal is 0 v.
In addition, a tone control defeat switch is provided.
The low filter uses a subsonic filter and a rumble filter.
Also, a scratch filter is used for the high filter.
Equipped with audio muting and mode selector.
Equipped with 4 ch input / output terminal.
Equipped with a microphone terminal.
Since around 1975, carrying handles have been sold as a separately sold option.
Model Rating
Type | Solid-state stereo premain amplifier | |||||||
Power Amplifier Unit | ||||||||
Effective power |
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Music Power (IHF) | 250W (4 Ω) 160W (8 Ω) |
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Total harmonic distortion factor (8 Ω) | 0.3% (at rated output) 0.05% (Rated Output -3dB) |
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Cross modulation distortion factor | 0.3% (at rated output) 0.05% (Rated Output -3dB) |
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Output Bandwidth (IHF) | 6 Hz to 45 kHz | |||||||
Residual noise (8 Ω) | 0.5mV | |||||||
Damping factor (8 Ω) | 30 | |||||||
Optimum load impedance | 4 Ω ~ 16 Ω | |||||||
Preamplifier Section | ||||||||
Input Sensitivity / Impedance | Phono1, 2 : 2.5mV/50k Ω Tuner, Aux, Tape playA, B : 150mV/50k Ω Mic : 2.5mV/50k Ω 4 ch input : 150mV/50k Ω |
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Signal-to-noise ratio (IHF-A network) | Phono1, 2 : 84 dB (input 5 mV) Tuner, Aux, Tape PlayA, B : 95 dB 4ch input:95dB |
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Output Level / Impedance | Tape rec Pin : 150mV/50 Ω Tape rec Din : 40mV/70k Ω 4 ch out : 150mV/50 Ω |
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Maximum Allowable Input (1 kHz, RMS) | Phono:250mV | |||||||
Frequency characteristic | Tuner, Aux, Tape play : 10 hz to 20 khz + 0 to 0.5 db Phono : RIAA deviation ± 0.5 dB |
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Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
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Filter | Low : 20, 40 Hz, 12dB/oct. High : 7 kHz, 6dB/oct. |
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Loudness control (Volume-30dB) | +8dB(100Hz) +3dB(10kHz) |
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<General> | ||||||||
AC outlet | Power switch interlock : 2 systems Power switch not linked : 1 system |
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Power supply voltage | 100 VAC, 50Hz/60Hz | |||||||
Rated power consumption (Electrical Appliance and Material Control Law) | 140W | |||||||
External dimensions | Width 435x Height 157x Depth 300 mm | |||||||
Weight | 11.8kg | |||||||
Sold Separately | Carrying Handle D-9 (1 pair, ¥ 5,000) |