AmperaTubes
The vacuum tube design companion. Archive, calculators, interactive guides, SPICE models — from pre-war Western Electric to modern JJ.
Every tube
has a voice.
Drag the Q-point across the plate characteristic curves and watch power, distortion, and gain respond in real time. 208 tubes with full Koren SPICE models ready for simulation.
330 vacuum tubes. Full specs, datasheets, Koren SPICE parameters.
Supply voltage, bias, load. SE or push-pull. Class A, AB, or B.
Output power, H2/H3 distortion, gain, impedance. Transfer curves.
32InteractiveGuides
Amperatronics 2026 — a structured learning path from first principles to advanced amplifier topologies. Each guide features interactive diagrams, live simulations, and working circuit examples.
331 Vacuum Tubes
From octal-base power triodes to miniature noval preamp tubes — each entry includes full electrical specifications, pinout diagrams, sonic character descriptions, operating presets, and SPICE model parameters where available.
Compare Any
Two Tubes
Overlay plate curves, compare gain structures, and see which tube fits your circuit. Every specification side by side.
Open Comparator →The Story of
Amplification
Fleming Valve
John Ambrose Fleming patents the first thermionic diode — the vacuum tube is born.
Miniature Revolution
Noval-base miniatures replace octals, shrinking amplifiers and enabling hi-fi.
Audiophile Renaissance
New-production tubes from Russia and China reignite demand for valve amplification.
Start designing.
331 tubes · 208 SPICE models · 32 guides · Free & open