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Pass Labs INT-25

Pass Labs INT-25 A smaller stereo Class A amplifier at a lower price, it takes advantage of the lower power requirements to have simpler single-ended circuitry and fewer parts in the signal path. This also allows elimination of degeneration, “that other negative feedback” in all stages.

Simpler and fewer gain stages improves speed and stability. Lower voltages means the ability to run gain devices at higher bias currents, more deeply into Class A.

Newer power Fet technology replaces banks of parallel small transistors with a single pair of industrial devices, each having a 700 watt / 40 amp rating.

With no current-hogging issues and a new constant-current bias circuit to compensate for temperature drift, they connect directly to the loudspeaker without ballast resistors for lowest possible distortion and highest damping factor. No degeneration also increases the efficiency and Class A operating current, allowing greater Class A operation into low impedance and reactive loads.

Click to read Stereophile magazine' review

A new breath to Music

The INT-25’s amplifier stage is paired directly without any DC servos or frequency compensation, neither adding nor detracting from the music.

As with all Pass enhancers, the technology and construction only add to the listening experience. The INT-25 has excellent measurements, but what is most special is its qualities. In an industry where great products are often found dry and boring, this amplifier breathes new life into music.