Pro-Ject Phono Box MM DC
Pro-Ject Phono Box MM DC phono preamplifier, designed to amplify and correct the signal from an MM cartridge before the line input of an amplifier.
Description
The Phono Box MM DC is a phono preamplifier from Pro-Ject, designed for moving magnet (MM) cartridges. It sits between a turntable and the line input of an amplifier that does not have a built-in phono stage, applying the RIAA correction needed to play records.
The casing is fully metal, which protects the internal circuits from electromagnetic interference and mechanical vibration, two well-known sources of noise in phono stages. The electronics are built around low-noise integrated circuits, combined with a dual-mono topology that processes the two stereo channels separately in order to preserve separation between the left and right channels. The RCA connections are gold-plated, a treatment that limits oxidation of the contacts over time. The unit is supplied with its dedicated external power supply.
This preamplifier is aimed at vinyl enthusiasts with an amplifier or turntable lacking a built-in phono stage, who want a compact solution dedicated to an MM cartridge rather than an MC cartridge. It is suitable both for a first-time setup and for an existing system that one wishes to free from a generic or lower-quality built-in phono preamplifier.
What to check before buying used
Check that the internal relay drawer does not stick and that the low-noise integrated circuits produce no hum or hiss once the unit has warmed up. Test the gold-plated RCA sockets at both input and output: play or poor contact is enough to cut out a channel. Finally, check the presence and condition of the dedicated external power supply, specific to this model and difficult to replace with a generic unit.
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