Cambridge Audio ALVA DUO
Cambridge Audio ALVA DUO phono preamplifier designed to amplify the signal between a turntable and an amplifier while preserving its quality.
Description
The ALVA DUO is a phono preamplifier from Cambridge Audio, designed to be placed between a turntable and an amplifier. Its function is to raise the level of the signal from the cartridge to a level usable by the line input of an amplifier, whilst seeking to preserve the finesse of the original signal.
The manufacturer highlights the choice of so-called premium components and materials in the design of this unit, an approach aimed at limiting signal alterations during amplification and retaining the details present in the record groove.
This phono preamplifier is aimed at vinyl enthusiasts who already own a turntable without a built-in phono stage, or who wish to replace an entry-level phono preamplifier with a dedicated model, designed to faithfully reproduce the analogue signal before it passes to the amplifier.
What to check before buying used
Check that both phono inputs (MM/MC) work properly and that there is no hum or crackling in the gain and impedance switches, which are often prone to contact oxidation on lightly used units. Also check the cleanliness of the RCA and earth connections, as poor contact produces a characteristic hum. The original external power supply must be present and functioning, as a replacement unit may degrade the stated performance.
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