Yamaha A-S501
Yamaha stereo integrated amplifier featuring a Pure Direct mode and optical and coaxial digital inputs, for precise music listening.
Description
The Yamaha A-S501 is an entry-level stereo integrated amplifier, designed drawing on the brand's acoustic expertise, historically linked to instrument making. It is built around a circuit design intended to faithfully reproduce different musical styles, following the approach Yamaha calls "Natural Sound".
This model offers a Pure Direct mode that bypasses the bass, treble and balance control circuits: the audio signal then takes a shorter path, which limits alterations and reproduces musical nuances with greater precision. A Loudness control on the front panel completes the package: unlike a conventional volume control, it adjusts the balance of high and low frequencies to compensate for their natural loss at low listening levels, thereby maintaining a balanced tonal range whatever the listening volume.
In terms of connectivity, the A-S501 features optical and coaxial digital audio inputs, intended respectively to receive the signal from a television and from a Blu-ray player. The connectors and terminals are gold-plated, a treatment that limits contact corrosion and helps maintain stable signal transmission over time.
This amplifier is aimed at anyone wishing to build or complete a simple stereo system, combining digital and analogue sources, without necessarily seeking the features of a high-end amplifier. Its versatile connectivity makes it suitable both for music listening and for combined use with a television or Blu-ray player.
What to check before buying used
On the Yamaha A-S501, test the volume potentiometer and input selector: crackling or cutting out when turning them often indicates an oxidised contact, fixable with cleaning but worth checking before purchase. The power supply capacitors age over time and may alter the sound character or cause an audible hum at idle. Also check that the Pure Direct mode and Loudness control work properly, as well as the condition of the gold-plated terminals, which should show no signs of corrosion.
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