Exclusive F3
¥ 250,000 (around 1978)
Commentary
This FM stereo tuner has been completed through numerous experiments and trial listening in order to realize the "beauty of music" which is the original purpose of audio equipment.
It uses lock tuning by APC (automatic phase control) with built-in crystal oscillator to prevent tuning deviation called drift.
In addition, the receiving frequency is in increments of 100 kHz, and the tuned frequency is locked as it is, making tuning easy.
The front-end section consists of a 7-series varicon for FM and dual-gate MOS FETs selected one by one.
It is equipped with IF band switching, and the wide-band uses the 8th LC phase linear filter with excellent distortion.
The measured values for each unit are attached as is.
Model Rating
Type | FM stereo tuner | |||||||||||||||||||||||
Circuit system | MOS FET RF2-stage, 7-train varicon APC system フェイズロックト tuning type IF BAND switching ultra-wide band linear detector 19 kHz canceller circuit PLL + Double NFB Method MPX |
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Practical sensitivity |
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Signal-to-noise ratio |
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Harmonic distortion factor |
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Capture ratio | wide:1.0dB narrow:2.0dB |
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Capture ratio |
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Separation |
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AM suppression ratio | wide:60dB narrow:60dB |
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Carrier leak suppression ratio | wide:70dB narrow:50dB |
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Frequency characteristic | 20 Hz ~ 10 kHz + 0 -0.2 dB 20 Hz ~ 15 kHz + 0 -0.5 dB |
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Image interference ratio | 120 dB or more | |||||||||||||||||||||||
IF interference ratio | 120 dB or more | |||||||||||||||||||||||
Spurious interference ratio | 120 dB or more | |||||||||||||||||||||||
Muting action level | 5 μ V ~ 1.6 mv Variable | |||||||||||||||||||||||
Antenna | 300 Ω Balanced Type 75 Ω Unbalanced Type |
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Output Level / Impedance | Fixed : 650mV/3k Ω Variable : 70 mv ~ 2V/5k Ω 4 ch MPX : 400mV/1k Ω |
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Semiconductor used | Transistor : 71 FET : 10 IC : 20 Diode, etc. : 57 |
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Power supply voltage | 100 VAC, 50Hz/60Hz | |||||||||||||||||||||||
Rated power consumption | 25W | |||||||||||||||||||||||
AC outlet | Power switch not linked : 1 system | |||||||||||||||||||||||
External dimensions | Width 468x Height 206x Depth 389 mm | |||||||||||||||||||||||
Weight | 16.6kg |