Stereophile magazine reviews Pass Laboratories
INT-25 Class A Integrated Amplifier -
"Every day, the Pass Labs INT-25 sounded like a purer, more austere instrument than the combination of the Pass Labs XA25 amplifier with any of my in-house preamps. Every day, I noticed how the INT-25 offered a less obstructed and more transparent view of what my source components were excavating from my recordings. In addition, it made my hi-fi less hi-fi and the musicians more there—with a lower level of editorializing than I've gotten from any previous amp-preamp combination I've reviewed. My new solid-state reference."
https://www.stereophile.com/content/pass-labs-int-25-integrated-amplifier
At
Pass Labs we build FET amplifiers with excessive output stages, huge heat sinks and massive power supplies. We use the highest quality components in simple linear topologies, assembled and tested with care and subtlety. They measure well, sound great, and are reliable. Twenty plus years of ongoing innovation have kept the
X and
XA amplifiers at the forefront of high-end audio.
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.
The simple front end circuit uses two pairs of our favourite NOS complementary FET's in common-source mode in a current feedback (CFA) configuration.
The preamp section is a simplified single-ended version of the one used in the
INT-60 and
INT-250 with three line level inputs and no line level output.
Everything done in the signal chain from the microphone to the loudspeaker, forever leaves an indelible mark on the music. The
XA25 amplifier section is direct coupled requiring no DC servos or frequency compensation, neither adding too or subtracting from the experience.
As with all
Pass amplifiers, the technology and construction are strictly in the service of the listening experience. The
INT-25 measures superbly, but its subjective qualities are most special. In an industry where products with great specs are often found to be dry and boring, this amplifier breathes new life into the music.
Pass Laboratories
INT-25 Class A Integrated Amplifier UK RRP £7190
Pass Laboratories. Elevating your audio experience.
Website:
http://www.musicraft.co.uk
Please call 01332 346284, 07727 272443 or email
[email protected]
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Rick @ Musicraft