Phonostages — Boulder 508

The 508 is a phono preamplifier from Boulder, an American manufacturer with a considerable reputation for uncompromising high-end electronics engineering, built with substantial gain and low distortion. The 508 brings Boulder's meticulous engineering to serious phono amplification.

Key specs that matter

One balanced XLR input is provided. MM input impedance is the standard 47,000 ohms, while MC current-sensing input impedance is 100 ohms. Output impedance is 100 ohms. Gain is a substantial 70dB for MC or 44dB for MM. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Total harmonic distortion plus noise is 0.01%. At 115.0 x 23.1 x 92mm and 5.2kg, the 508 maintains a manageable phono preamplifier chassis reflecting Boulder's uncompromising build standards.

Sound and use context

Expect clean, accurate RIAA equalisation reflecting the low 0.01% distortion figure, combined with substantial gain across both MM and MC cartridge types.

Pairing

Boulder's own 1110 preamplifier and 861 or 1151 power amplifiers offer natural, brand-coherent pairings for a fully Boulder-voiced system.

Alternatives

Other manufacturers' flagship phono preamplifiers offer alternatives for buyers wanting to compare similarly ambitious engineering.