Spotfire Tube Amplifier Kits
SpotFire valve amplifier kits offer the sound quality associated with audiophile-grade tube amplifiers, and professional grade guitar amplifiers,
implemented with thoughtful engineering rather than unnecessary complexity.
Practical Audio Engineering Explained
The Spotfire Engineering Library below explains the theory underpinning the Spotfire designs. We want you to understand how and why we do things the way we do.
Why Choose Spotfire®?
Each kit is:
professionally designed
built using high-quality audio-grade components
supplied with clear, step-by-step documentation
Intended to last
SpotFire kits are intended to be built, understood, and kept — not treated as disposable projects.
Safety Comes First
Valve equipment operates at high temperatures and potentially dangerous voltages.
When designed and used correctly, tube amplifiers are safe.
However, builders and users must observe appropriate precautions.
Key points:
Tube equipment contains high voltages that can persist after power is removed
Valves operate at high temperatures and can cause burns
Equipment must be placed away from flammable materials
Adequate ventilation is essential
Tube amplifiers should not be left unattended during operation
Supervise children around tube equipment. Do not place tube equipment where children may come into contact with hot parts.
Is it a Valve or a Tube ?
The terms Valve or Tube are used variously around the world. Both terms are used interchangeably throughout this website. Understanding valve audio leads to better systems and more satisfying builds. Follow the links below to learn more.
What Builders Say
“My very first impression was that a curtain had been removed from the sound.
A brilliant appearance of high and mid frequencies — the music feels tangible.
My sincere compliments on the SE5 project, and thank you for your patience and support.”*
— Dario, Italy
® SPOTFIRE, Spotfire Tube Audio, and Red Roo Rockstar, are registered trademarks. Spotfire Tube Audio (formerly Red Roo Kits).