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 Class A 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 70W plate 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.
KT150 VS KT88
The KT88 has long been one of the reference high-power output tubes used in both guitar amplifiers and Hi-Fi systems. Comparing it with the KT150 helps illustrate how far modern power tube design has evolved.
While both tubes are capable of excellent performance, the KT150 was developed as a significantly higher-power device. Its 70W plate dissipation capability exceeds the KT88's 42W rating, allowing amplifier designers to explore applications that would be difficult to achieve with more traditional tube families.
| FEATURE | KT88 | KT150 |
|---|---|---|
| Launch Year | 1956 | 2013 |
| Maximum Plate Dissipation | 42W | 70W |
| Typical Applications | Guitar Amplifiers, Hi-Fi | High-End Hi-Fi |
| Theoretical Maximum Output Power Single-Ended |
~21W | ~35W |
Redefining Tone
By choosing the KT150, De Cillia Amplification brings a tube celebrated in Hi-Fi into a groundbreaking guitar amplifier.
The result is a guitar amplifier that combines the dynamics and harmonic richness of traditional single-ended designs with power levels rarely achieved in this topology—a new standard for boutique guitar amplification.