TRIO KR-4200
¥ 59,900 (around 1973)
Commentary
An AM/FM stereo receiver that employs a double-switching and de-modulator system.
The multi-section of the tuner section employs a double switching and de-modulator system.
It is designed to cancel the leakage signal by making the outputs of the main switching circuit and the auxiliary switching circuit symmetrical, taking them in opposite phases, and adding the outputs of both switching circuits.
This prevents degradation of the separation caused by adverse effects on the high-frequency range of the SCA filter and phase shift at the IF stage.
The front-end uses high-performance FET and 3-row varicon, and the IF uses circuit elements such as 2-element mechanical filters and high-gain ICs to improve various characteristics.
In addition, it is equipped with FM muting, which can cut troublesome inter-station noise.
In the main amplifier section, all stages are directly connected and pure complimentary service circuit using ± 2 power supply system without interstage coupling condenser is adopted, and various characteristics of low sound range are improved.
The protection circuit consists of an excess current detection circuit developed by Trio and a DC voltage detection circuit for the L/R output terminal as an OR circuit.
When either one of the detection circuits operates, the discharge circuit turns ON, the Schmidt circuit operates, and the relay circuit is driven to disconnect the output terminal from the amplifier circuit to protect the speaker.
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Model Rating
| Type | Solid State AM/FM Stereo Receiver | ||||||
| Amplifier Unit | |||||||
| Music Power (IHF) | 82W (4 Ω) 62W (8 Ω) |
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| Effective power |
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| Total harmonic distortion factor (8 Ω) | Rated output : 0.7% or less -3dB at rated output : 0.2% or less |
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| Intermodulation distortion factor (8 Ω) | Rated output : 0.7% or less -3dB at rated output : 0.2% or less |
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| Frequency characteristic | 22 Hz to 35 kHz ± 2 dB | ||||||
| Output Bandwidth (IHF) | 25 Hz to 25 kHz | ||||||
| Damping factor | 50 (8 Ω) | ||||||
| Input Sensitivity / Impedance | Phono : 3mV/50k Ω AUX-1, 2 : 180mV/50k Ω MIC : 2mV/30k Ω Tape Play-A, B : 200mV/45k Ω |
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| Recording and re-outputting PIN/DIN | 150mV/30mV | ||||||
| Signal-to-noise ratio | Phono:63dB AUX:64dB MIC:55dB Tape Play:75dB |
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| Tone control | 100 Hz : + / - 10 dB 10 kHz : ± 10 dB |
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| High filter | 10 kHz, -10dB | ||||||
| Loudness control | 100Hz:+10dB 10kHz:+5dB |
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| FM Tuner Section | |||||||
| Receiving frequency | 76 MHz to 90 MHz | ||||||
| Antenna impedance | 300 Ω Balanced Type / 75 Ω Balanced Type | ||||||
| Sensitivity | 2.0 μ V/84MHz (IHF) | ||||||
| Chinese arrowhead's slope | 5 μ V : 48 dB 10 μ V : 60 dB 50 μ V : 63 dB |
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| Distortion Factor (400 Hz, 100% modulation) | Stereo : 0.8% or less Mono : 0.5% or less |
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| SN ratio (100% modulation, 100 μ V input) | 63 dB or more | ||||||
| Capture ratio | 3.0dB(IHF) | ||||||
| Selectivity | 50 dB or more (IHF) | ||||||
| Image ratio | 60 dB or more | ||||||
| IF interference ratio | 90 dB or more | ||||||
| AM suppression ratio | 60 dB or more | ||||||
| Harmonic spurious ratio | 90 dB or more | ||||||
| Separation (1 kHz) | 40 dB or more | ||||||
| Band Separation (50 Hz to 8 kHz) | 28 dB or more | ||||||
| Subcarrier suppression ratio | 45 dB or more | ||||||
| <AM Tuner Section> | |||||||
| Receiving frequency | 520 kHz to 1610 kHz | ||||||
| Sensitivity | 25 μ V (IHF) | ||||||
| Selectivity | 30 dB or more (IHF) | ||||||
| Image ratio | 45dB | ||||||
| IF interference ratio | 35 dB or more | ||||||
| <General> | |||||||
| Pwer | 100 VAC / 117 V, 50Hz/60Hz | ||||||
| Rated power consumption | 75W | ||||||
| External dimensions | Width 435x Height 144x Depth 346 mm | ||||||
| Weight | 10.7kg | ||||||