DiMastro GTA — Tube Bias, Tone Stack & Virtual Oscilloscope Pro

Tools & Guides

Work out safe plate dissipation and dial in idle bias for your power tubes.

Watch the power-stage scope trace live as you turn up volume and tone, with clipping and bias effects modeled.

Solve bass/mid/treble response for Fender, Vox, and Marshall circuits.

The complete engineering, diagnostics & restoration manual — topologies, bench practice, troubleshooting, and bias calibration.

Biasing, startup, recapping, and safe power-supply discharge guides.

Normal channel reverb, NFB voicing and Triode / Pentode mods.

Build your own bias probes, current limiter, cap discharge stick, and dummy load.

Install the bias, tone stack, resistor, and capacitor tools as mobile apps.

Resistor and capacitor toolkits, tube cross-reference, and a full set of bench calculators.

Bringing vintage guitar amplifiers back to life.