¥ 33,800 (released in June 1970)
This FM/AM tuner uses new FM technology to improve practical performance.
The FM front-end has improved intermodulation characteristics, image ratio, S/N ratio, and distortion by using FET and frequency linear type 3-row varicon.
The IF stage has excellent IF characteristics with 4-stage IF and 3-stage limiter using IC.
As a result, the effective selectivity of the IF stage has been dramatically improved to 45 dB. Along with the improvement of the capture ratio, the distortion factor, separation characteristics, and phase characteristics in the high frequency range at the time of stereo broadcast transmission reception have been improved.
In addition, the AGC eliminates distortion caused by strong input.
The MPX circuit has a highly reliable circuit configuration with an SCA filter and an LC-type carrier leak filter with sharp cutoff characteristics.
This reduces beat interference and intermodulation distortion.
By adopting a new method instead of the conventional high-cut filter, we have succeeded in reproducing frequencies above 10 kHz.
By using a frequency number line type 3-row varicon, the frequency scale is equally spaced from 76 to 90 MHz.
With a round dial, 1 MHz can be divided into four and read every 250 kHz.
In addition, the dial is a fantastic illumination dial made of smoked acrylic, and the pointer is self-written and easy to see.
It is equipped with pure electronic FM stereo / mono switching. In FM AUTO, when FM broadcasting changes from mono to stereo, the electronic switch automatically operates and switches to stereo.
In stereo mode, the stereo indicator lights up.
In addition to the 300 Ω balanced antenna input terminal, a 75 Ω terminal for coaxial cable is mounted.
A muting circuit is adopted in order to eliminate noise entering between stations during channel selection.
The AM section is highly sensitive by using a large ferrite bar antenna and ceramic filter, improving selectivity and Radio noises rejection capability.
The power supplies for the IF stage and the front end of the FM IF are stabilized power supplies with ripple filters. In particular, the front end has succeeded in eliminating the AFC circuit by minimizing local drift.
The output circuit has a semi-fixed output level adjustment so that it can be connected to any amplifier, and can be set to the level corresponding to the program source.
|FM Tuner Section|
|Receiving frequency||76 MHz to 90 MHz|
|Sensitivity||20 dB quieting : 2 μ V
IHF : 2.5 μ V
|Total harmonic distortion factor||Not more than 0.8%|
|Signal-to-noise ratio||65 dB or less|
|Selectivity||45 dB or more|
|Capture Ratio (IHF)||3dB|
|IF Rejection||60 dB or more|
|Image フレクェンシー Rejection||55 dB or more|
|Spurious response rejection||60 dB or more|
|FM stereo / separation||35 dB or More (400 MHz)|
|Unwanted radiation||34 dB or less|
|Antenna and input impedance||300 Ω : Balanced
75 Ω : Unbalanced
|<AM Tuner Section>|
|Receiving frequency||535 kHz to 1605 kHz|
|Sensitivity||150 μ V (1000 kHz, bar antenna)|
|Image フレクェンシー Rejection||40 dB or More (1000 kHz)|
|Selectivity||25 dB or More (1000 kHz)|
|Semiconductor used||Transistor : 24
Diode : 19
|Power supply voltage||100 V, 50Hz/60Hz|
|External dimensions||Width 335x Height 127x Depth 278 mm|