Vacuum Tube Design Software -

: Widely considered the gold standard for tube hobbyists. It is free and has a massive community-driven ecosystem of tube models (triodes, pentodes, etc.).

These tools are specifically built for the unique math involved in vacuum tube physics, such as load line calculations and grid behavior. Vacuum Tube Design Software

: A specialized, widely recommended tool for designing tube power supplies. It is much faster and simpler to use for this specific task than full SPICE simulators. 3. Advanced & High-Power Simulations : Widely considered the gold standard for tube hobbyists

: A legacy program from GlassWare Audio Design that calculates gain, phase, output impedance, and heat dissipation for dozens of tube circuit types. : A specialized, widely recommended tool for designing

: Specifically designed for Single-Ended (SE) amplifier design, focusing on power output and distortion characteristics.

For engineering beyond simple audio amplifiers, such as microwave or industrial devices, more complex software is required.