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The Kenwood KR-4200 is a vintage stereo receiver manufactured in the 1970s by the Kenwood Corporation, a Japanese company specialising in audio and electronic equipment.
This AM/FM stereo receiver uses a dual-switching system and demodulator, designed to cancel out the leakage signal by making the outputs of the main switching circuit and the auxiliary switching circuit symmetrical, bringing them into opposite phases and summing the outputs of both circuits. This prevents deterioration in separation caused by adverse effects on the high-frequency range of the SCA filter and by phase shift in the IF stage.
The front-end utilises high-performance FETs with a 3-stage varicon, whilst the IF employs circuit elements such as 2-element mechanical filters and high-gain integrated circuits to improve reception characteristics. It is also equipped with FM muting, which can eliminate annoying noise between stations.
In the main amplifier section, all stages are directly coupled, and a pure complementary drive circuit is adopted, utilising a dual power supply system without an interstage coupling capacitor; the low-frequency response characteristics are particularly improved.
The protection circuit consists of an overcurrent detection path developed by Trio and a DC voltage detection circuit for the L/R output terminal acting as an OR circuit. When one of the detection circuits is triggered, the discharge circuit is activated, the relay circuit is driven to disconnect the output terminal from the amplifier circuit to protect the loudspeaker.
The KR-4200 features a design typical of stereo receivers of the era, with a front panel housing a series of controls, knobs and indicator lights, illuminated scales with light guides, a wooden cabinet, an anodised front panel and a built-in phono stage: all this, not to mention the sound quality, in the spirit of the ‘golden age of audio’.
The unit has been fully refurbished and is in fair cosmetic condition.
