Pathos Adrenalin Monoblock Amplifier

This is the amp Kevin has chosen for his flagship home system. A tube input stage is coupled with the apex of Pathos' InPol technology for the output stage

One hundred and fifty pounds of sheer audio heft combined with the delicacy and imaging of tubes. It's hard to imagine, but Pathos has done it.

This giant power amplifier represents the apex of InPol technology. InPol (Inseguitore Pompa Lineare- Linear Pump Follower) is a Pathos patented system that allows for much greater output in pure Class A. This fully balanced circuit design uses a single solid-state component in follower configuration, with a high-current gain and voltage gain together.

In the Adrenalin it results in a sensitive and refined amp with astonishing output capability. A unitary gain power buffer is controlled by a tube amplification stage using three double triodes, two ECC83/12AX7 and one 6H30. The first stage generates voltage amplification, and the second is a buffer with a common anode with the 6H30 that drives two groups of power MOSFETs. The result is a very powerful, extremely linear amplifier without global feedback.

Pathos, as usual, did not skimp on any components and has used an optimum inductive/capacitive switching power supply able to perfectly filter the electrical current of the two power stages. This reactance filter weighs over 26 pounds!

What is InPol?

When you listen to music, you’re not just hearing notes—you’re experiencing emotion. That’s the promise of Pathos’ revolutionary InPol technology: a design created to deliver all of that emotion.

Traditional amplifier designs force a compromise between the warmth of tubes and the control of solid-state. InPol (short for Inseguitore Pompa Lineare, or Linear Pump Tracker) erases that compromise. It’s a patented, fully balanced, class-A topology where a single triode stage handles all voltage amplification—and maintains 100% of its sonic signature—while the InPol circuit delivers the current gain needed to drive even the most demanding speakers effortlessly.

Features of InPol

1. Pure Class-A with No Distortion
InPol doesn’t dilute or "correct" the tube signal with negative feedback or transistor interference. Instead, it uses a specially designed current amplifier that mirrors the exact character of the tube stage, with zero phase shift or tonal coloration. The result? The harmonic beauty and liquidity of tubes, with the authority and grip of solid state.

2. Emotionally Engaging Sound
There’s a reason Pathos fans describe InPol amps as “addictive.” Music flows with natural presence, dimensionality, and richness—an emotional connection that standard designs just can’t replicate. Voices are human, strings are alive, and the soundstage breathes.

3. Exclusive, Patented Technology
Only Pathos builds amplifiers like this. The InPol circuit is a patented innovation, handcrafted in Italy and unavailable from any other brand. This isn’t another copycat design—it’s a true original for those who want something extraordinary.

4. The Best of Both Worlds
Tube magic meets muscle. The warmth and finesse of tubes drive the musical expression, while the InPol stage delivers the speed, control, and punch that brings complex music to life. It’s a marriage of passion and precision.

5. Class-A with Efficiency
Traditional class-A amps waste enormous energy as heat. InPol’s design cleverly maximizes thermal and electrical efficiency, delivering the full benefits of class-A operation with far fewer compromises—proving you can have purity and performance in one stunning machine.

Specifications

Inputs: Balanced XLR x 1, RCA x 1

Input Impedance: 100 Ohm

Output Power: 200 W at 8 Ohm

Frequency Response: 5 Hz to 60 kHz +/- 0.3 dB

SNR: 98 dB

THD: 0.01 % at 1 W, 0.2 % at 50 W

Power Consumption At Rest: 475 W

Tube Complement: 6H30 x1, 12AX7 x 2

Damping Factor: 25

Dimensions (WHD): 11.8" x 26.7" x 17.3"

Weight:  154 lb