A free, component-level-modeled tube preamp for VST3/Standalone (Windows) — cascaded gain stages, dynamic bias-shift, and transformer saturation in a precise, modern control surface.
Download the manual (PDF, 1.3MB)The Biased hero display reads the actual DSP state live — four waveform lanes from input through output, a transfer-curve plot pulled from the same math the audio thread runs, and a heat-ramp meter that glows hotter as the tube is driven harder.
Drive · Stage 2 · Bias · Sag
Two cascaded gain stages, a real grid-bias point, and supply sag under drive — the core of the tube’s response.
Grit · Input Iron · Output Iron
Asymmetric pentode clipping plus independent input/output transformer saturation.
Age · Capacitance
Capacitor-aging coloration across three capacitance sizes, from tight and modern to loose and worn.
Output
Final output trim.
Env Depth · LFO Rate · LFO Depth · LFO Shape
An envelope follower and a free-running LFO — four shapes — for movement over time.
A small quality-of-life addition: Biased now remembers how big you like its window.