TRIO KR-7070
¥ 150,000 (around 1970)
Commentary
FM/AM receiver equipped with auto-tuning mechanism.
FET is used for the front end of the FM tuner section and crystal filter and IC are used for the IF amplifier section to improve the image ratio, intermodulation distortion factor and S/N ratio.
Equipped with electronic FM mono / stereo switching mechanism.
If you set the selector to FM-Auto, stereo broadcast transmission reception will automatically switch to stereo reception and the indicator lamp on the dial will light.
Equipped with SCA filter.
The KR-7070 is designed so that the MC cartridge can be connected as it is without using a booster transformer.
Equipped with a purely electronic protection circuit to protect the power transistor.
Model Rating
| Type | FM/AM Receiver | ||||
| Amplifier Unit | |||||
| Music Power (IHF) | 300W (4 Ω) 220W (8 Ω) |
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| Effective power |
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| Harmonic distortion factor | 0.5% or Less (Rated Output) 0.05% or Less (-3dB at Rated Output) |
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| Frequency characteristic | Main input : 5 Hz to 120 kHz ± 1.5 dB Aux : 12 Hz ~ 40 kHz ± 1.5 dB |
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| Output Bandwidth (IHF) | 10 Hz to 30 kHz | ||||
| Damping factor | 50 (8 Ω) | ||||
| Input Sensitivity / Impedance | Phono1 : 2.5mV/50k Ω, 0.05 mV 0.5mV/200 Ω Phono2 : 2.5mV/50k Ω Mic : 2.5mV/100k Ω Aux, Tape play : 200mV/100k Ω Main in : 1V/100k Ω |
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| Recording and re-output (at rated output) | Pin:200mV Din:40mV Dubbing:200mV |
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| SN ratio (rated input) | Phono1 : 65 dB (2.5 mV), 45 dB (0.05 mV), 54 dB (0.5 mV) Phono2:65dB Mic:67dB Aux, Tape play : 75 dB |
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| Tone control | ± 10 dB (100 Hz) ± 10 dB at 10 kHz |
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| High filter | -10dB(10kHz) | ||||
| Low filter | -7dB(100Hz) | ||||
| Loudness control | +6dB(400Hz) +6dB(10kHz) |
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| Audio Muting | -20dB | ||||
| FM Tuner Section | |||||
| Antenna impedance | 300 Ω balanced / 75 Ω unbalanced | ||||
| Sensitivity (IHF) | 1.5 μ V | ||||
| S/N | 70 dB or more | ||||
| Distortion Factor (400 Hz, 100% modulation) | Stereo : not more than 0.6% Mono : 0.4% or less |
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| Capture Ratio (IHF) | 1.5dB | ||||
| Selectivity (IHF) | 75 dB or more | ||||
| Image ratio | 100 dB or more | ||||
| IF Rejection | 100dB | ||||
| AM suppression | 55 dB or more | ||||
| Harmonic spurious response | 100 dB or more | ||||
| Stereo separation | 35 dB or More (1 kHz) 25 dB or More (10 kHz) |
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| Subcarrier suppression | 55 dB or more | ||||
| Front end | 3 FET, 4 Series Varicon | ||||
| IF Stage | 4 ic, Mechanical Filter | ||||
| Output terminal | FM multipath output terminal Remote control terminal for auto tuning |
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| <AM Tuner Section> | |||||
| Antenna | Built-in high sensitivity ferrite bar antenna | ||||
| Sensitivity (IHF) | 15 μ V | ||||
| S/N | 50dB | ||||
| Selectivity (IHF) | 30 dB or more | ||||
| Image ratio | 70 dB or more | ||||
| IF Rejection | 60 dB or more | ||||
| Front end | 3-FET, 3-series varicon | ||||
| IF Stage | Mechanical filter | ||||
| <General> | |||||
| Accessory function | Tape monitor Low filter High filter FM muting Audio Muting Autotuning Loudness control |
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| Semiconductor used | Transistor : 68 FET : 4 pcs IC : 4 Diode : 51 Units CDS : 3 pcs |
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| Pwer | 100 VAC / 117 V, 50Hz/60Hz | ||||
| Power consumption | 320W at maximum output 40W (No Signal) |
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| External dimensions | Width 432x Height 165x Depth 370 mm | ||||
| Weight | 18kg | ||||