TRIO KA-1400
¥ 34,800 (around 1973)
Commentary
Pre-main amplifier with all stages directly connected + pure complimentary service circuit.
All stages are connected directly to the main amplifier section. Interstage coupling capacitors are removed from the first stage to the last stage. In addition, a ± 2 power supply system using a first stage differential system is adopted. The potential at the output terminal of the amplifier is set to 0, and deep NFB is applied to extend various characteristics to the ultra-low frequency range.
In addition, a pure complimentary service circuit using the Darlington method of PNP-NPN is adopted for the output stage to suppress distortion of the amplifier.
It is equipped with an electronic protection circuit by DC drift detection and ASO detection, and a protection circuit by 3 layers protection of quick acting fuse.
A transistor is used for adjusting the idle current to obtain stable operation that is resistant to fluctuations in power Dainyu and power supply.
Equipped with a tone control defeat circuit.
A transformer with a short ring is used to improve the SN ratio.
DIN terminal and microphone terminal are mounted on the front.
Model Rating
| Type | Pre-main amplifier | ||||
| Main Amplifier Section | |||||
| Effective power |
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| Music Power (IHF) | 80W (4 Ω) 52W (8 Ω) |
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| Total harmonic distortion factor (8 Ω) | 0.5% (at rated output) 0.1% (at rated output -3dB) |
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| Intermodulation distortion factor (8 Ω) | 0.5% (at rated output) 0.2% (at rated output -3dB) |
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| Output Bandwidth Characteristics (IHF) | 15 Hz ~ 40 kHz | ||||
| Residual noise | 1 mv (8 Ω) | ||||
| Damping factor (1 kHz) | 30 (8 Ω) | ||||
| Optimum load impedance | Speaker : 4 Ω ~ 16 Ω Headphones : 4 Ω ~ 16 Ω |
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| Preamplifier Section | |||||
| Input Sensitivity / Impedance | Phono1, 2 : 2.5mV/50k Ω Mic : 3.0mV/50k Ω Tuner, Aux, Tape Play : 150mV/50k Ω |
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| Signal-to-noise ratio | Phono1, 2 : 70 dB Mic:70dB Tuner, Aux, Tape Play : 80 dB |
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| Recording Output Level / Impedance | A Tape Play (Pin) : 150mV/110 Ω B Tape Play (Din) : 30mV/80k Ω |
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| Phono maximum allowable input (1 kHz) | 280mVp-p | ||||
| Frequency characteristic | Aux, Tuner, Tape : 20 Hz to 50 kHz ± 2 dB | ||||
| RIAA deviation | ± 1 dB | ||||
| Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
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| High-cut filter | 7 kHz, 6dB/oct. | ||||
| Loudness control | 100Hz:+8dB 10kHz:+3dB |
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| <General> | |||||
| Power supply voltage | 100 VAC, 50Hz/60Hz | ||||
| Power consumption (Electrical Appliance and Material Control Law) | 43W | ||||
| Power outlet | Power switch interlock : 1 system, 100W Power switch not linked : 1 system, 200W |
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| External dimensions | Width 365x Height 117x Depth 263 mm | ||||
| Weight | 5.6kg | ||||