Pass Labs INT 25 - Class A Integrated Amplifier
The INT-25 embodies all this and less. 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.
Class - A (Integrated)
Inputs - Three (3) RCA
Remote - Yes
Gain - 26 dB gain
Output Power - 25 Watts rms @ 8 ohms / 50 Watts rms @ 4 ohms
Distortion - 0.1% @ 25 Watts, 8 ohms, 1 KHz
Class A Envelope - 50 Watt peak for 2, 4 or 8 ohm load
Bandwidth - DC to -2 dB @ 100 KHz
Noise - Less than 150 uV output, unweighted 20 to 20 KHz