KT150 output stage

The Single 25 and the Special 25 were 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 choosing the KT150, 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.