Audio Research PH9
Tube phono preamplifier by Audio Research, featuring remote-adjustable impedance settings to suit a wide range of cartridges.
Description
The PH9 is a phono preamplifier designed by Audio Research to interface between a cartridge and an amplifier or line preamplifier. Its role is to amplify and equalise the signal from the cartridge in order to reproduce a sound faithful to the original recording.
The circuit relies on a trio of 6H30 tubes, chosen to offer a simple and direct signal path, with the aim of sonic transparency. The unit provides five different impedance settings for cartridge loading, a feature that allows the preamplifier to be precisely matched to different types of cartridges, whether low or high impedance. These settings can be changed directly from the listening chair using the supplied metal remote control.
The PH9 also features a built-in menu system giving access to several useful functions: load impedance adjustment, tracking of tube usage hours, and management of the unit's automatic shutdown.
This preamplifier is aimed at vinyl enthusiasts with a quality turntable and cartridge, wishing to make the most of their potential through carefully designed tube amplification. Its loading versatility makes it a sensible choice for those with several cartridges or who enjoy fine-tuning the sound to their listening preferences.
What to check before buying used
When buying used, particular attention should be paid to the condition of the three 6H30 tubes, consumable parts whose lifespan is precisely tracked by the unit's built-in menu: their number of hours in use is a valuable indicator. It is also recommended to check that the metal remote control and the five impedance setting positions work correctly, as well as the general condition of the phono connections, which are prone to oxidation over time.
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