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Sansui AU-3900 amplifier
In the middle of the golden age
In 1975 Sansui is praised among the top brands. The quality of construction and materials used are still at the top, even if for this series the wood flanks are replaced by a more traditional metal hood. The control buttons also go for bigger, all aluminium ones.
Equipped with loudness, two speaker outputs and a mike entry, it still adopts a tiny footprint, making it very vintage.
The components themselves are at the top, with the large transformer, the Nichicon KG Gold Tune 3300µF condensers at output stage, pairing with the Sanyo TO-66 transistors on large aluminium dissipation radiator.
The session is balanced, warm and rich. The bass is full, deep and tight. Medium show transparency, detail and no acidity at all. Treble is silky, very natural. The respect of the scene and dimensions is absolutely managed while the power reserve brings lots of confidence despite the modest wattage on paper.
This example had a maintenace job by Labo Diva while still in a very good original condition. The power led works (very often faulty).
The cabinet and front panel are in good condition. The back panel is original. We provide female banana jack links for convenience.
Service manual available as a PDF file.
Tested, cleaned, deoxydized.
Perfect working condition, see the photo gallery for cosmetic signs of patina and age.
Made in Japan
Technical specifications
Phono: yes (MM)
Power output: 2x22 Watts RMS @ 8Ω
Frequency response: 10 - 40KHz
Total harmonic distortion: < 0.15%
Dimensions: 40 cm (W) x 12 cm (H) x 24 cm (D)
Weight: 5.5 Kg