Thorens MM-002
Compact Thorens MM-002 phono preamplifier with metal chassis and external power supply, designed to amplify MM cartridges on amplifiers lacking a phono input.
Description
The Thorens MM-002 is a phono preamplifier dedicated to amplifying the signal from a moving magnet (MM) cartridge. It is inserted between a turntable and an amplifier to restore a level and RIAA equalisation compatible with a standard line input.
Its metal chassis gives the unit a well-finished build, while the choice of an external power supply helps limit the size of the main casing. This separation of the power supply is a common approach on compact phono preamplifiers, intended to reduce electrical interference near the audio circuit.
This preamplifier is aimed primarily at owners of an amplifier without a built-in phono input, as well as vinyl enthusiasts equipped with an MM cartridge looking for a compact solution that can be simply added to their existing system.
What to check before buying used
Check that the RIAA equalisation circuit shows no hum or background noise once connected to the turntable, as this would indicate faulty capacitors or an earthing fault. Also check the external power supply: its cable and connector must be original and in good condition, otherwise the preamplifier may prove unstable or silent. Finally, test the input and output RCA sockets as well as the earth terminal, which are often subjected to wear from repeated connections.
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