KT150 output stage

The Single 25 was conceived as a bold new platform for musicians—introducing a fresh concept that challenges traditional conventions. A key part of this vision was utilizing a single-ended architecture capable of delivering substantial power. This necessitated selecting a tube with considerable power handling, which led to the choice of the Tung-Sol KT150.

While testing the first prototype, it was discovered that the KT150 offered not only outstanding dynamics but also exceptional musicality when overdriven—a second essential characteristic for a great guitar amplifier. This dual capability cemented its place at the heart of the Single 25.

From Hi-Fi to Guitar Amplifiers

Launched in 2013, the KT150 was initially designed for high-fidelity audio systems. With its high power dissipation capability and remarkable linearity, it quickly became a favorite in the Hi-Fi community for its ability to deliver detailed, accurate sound.

Why the KT150 ?

  • Massive Power Handling: Its 70W power dissipation enables, for the first time, a single-ended guitar amplifier delivering 25W of pure Class A power—a milestone achieved with the Single 25.

  • Clarity and Dynamics: The KT150’s linearity ensures crystal-clear note definition and a wide dynamic range, perfect for expressive playing.

  • Warm, Musical Overtones: When cranked or overdriven, the KT150 produces wonderfully warm and musical overtones, adding depth and character to the amp’s tone.

Redefining Tone

By integrating the KT150 into the Single 25, De Cillia Amplification brings a tube celebrated in Hi-Fi into a groundbreaking guitar amplifier.

The result is an amp that delivers unparalleled tone, clarity, and performance—a new standard for boutique guitar amplification.