Two Amplifiers in One — Triode Warmth or Pentode Power

The Unison Research Triode 25 Black Edition is a masterful fusion of classic tube warmth and contemporary digital versatility. A flick of a switch takes it from intimate, liquid triode mode to muscular pentode mode, letting you tailor the sound to the music and the moment. Building on the esteemed Triode 25, this Black Edition ups the power, adds the new DAC3 digital module, and wraps it all in a piano-black lacquered panel with dark anodized metal — as visually captivating as it is sonically impressive.

Push-Pull Power, Your Way

Four KT77 Gold Lion power tubes run in a push-pull, ultralinear Class-AB output that delivers 50 watts per channel in pentode mode and 30 watts in triode mode — both meaningful jumps over the outgoing model's 45W and 25W. Two ECC83 and one ECC82 Gold Lion signal tubes handle the front end, and revised signal paths with improved power management reduce distortion throughout. Adjustable bias and selectable feedback (10dB or 12dB) let you fine-tune the amp to your speakers and taste.

The DAC3 Module — Hi-Res, Built In

The new DAC3 module brings comprehensive digital connectivity: USB supports PCM up to 384kHz and DSD up to 256x, while Toslink and SPDIF inputs handle up to 192kHz. Whether you're spinning vinyl through the analog inputs or streaming high-resolution files, the Triode 25 Black Edition renders it all with that unmistakable Gold Lion tube magic.

Why You'll Love the Triode 25 Black Edition

• Switchable triode (30W) and pentode (50W) modes — two voices in one amp
• Four KT77 Gold Lion power tubes in a refined push-pull Class-AB output
• New DAC3 module: USB up to PCM 384kHz / DSD256, Toslink & SPDIF up to 192kHz
• Adjustable bias and selectable feedback for precise voicing
• High power output that's uncommon among tube amps in its class

Frequently Asked Questions

What's the difference between triode and pentode mode?

Triode mode (30W per channel) offers a sweeter, more intimate and liquid presentation, while pentode mode (50W per channel) delivers more power, drive and dynamic punch. You choose the mode to suit the music.

What digital formats does the DAC3 support?

Its USB input handles PCM up to 384kHz and DSD up to 256x; the Toslink and SPDIF inputs support up to 192kHz.

How is it different from the standard Triode 25?

More power (50W/30W vs. 45W/25W), the new DAC3 digital module, refined circuitry for lower distortion, and the striking piano-black Black Edition finish.

Triode 25 Black Edition Technical Specifications