Selmer Truvoice Universal Eight preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

A small early Truvoice amplifier from Selmer: a KTZ63 pentode drives a single KT33C in single-ended class A, with a U31 valve rectifier and an AC/DC universal supply. At about 8 watts it is a simple, warm British amp from the early valve era.

• Made in: UK
• Wattage: 8W
• Channels: 1
• Preamp tubes: 1× KTZ63
• Power tubes: 1× KT33C

Tags: british, vintage, class-a, low-wattage, clean.

Schematic-derived preset files for the Neural DSP Quad Cortex and 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.