02/06/2026
Some amplifiers reproduce music. The SIT-5 “resurrects” it.
Meet the First Watt SIT-5 — a power amplifier built around one of the rarest transistors on earth. The Tokin THF51s SIT (Static Induction Transistor) is so special, it doesn't just amplify a signal — it behaves like a vintage vacuum tube, delivering that legendary triode warmth and depth... without a single transformer in the signal path.
The story behind these parts? The factory that made them was destroyed in the Fukushima earthquake and tsunami. First Watt quietly tracked down the remaining inventory over several years. This is not mass production. This is a labor of obsession.
Designed by the legendary Nelson Pass — a man who has spent 57 years listening, measuring, building, and listening again — the SIT-5 is the result of a process that began in 2020 and was finally declared finished in 2024.
35 watts. Class A. Zero negative feedback. Pure second-harmonic soul.
If you've ever been moved by a great 300B tube amp and thought, "I wish this could drive my real speakers," — this is your amp.
