Guild Thunderstar Lead - Tremolo-Reverb preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Thunderstar Lead is a Guild guitar amp built as separate preamp and power chassis, drawn in 1969. Normal and Tremolo-Reverb channels, two inputs each, have their own volume, bass and treble on 12AX7 stages. A 6GW8 drives and recovers the spring reverb, and a 12AX7 oscillator runs an optical (LDR) tremolo with speed and depth. In the power chassis a split-load inverter drives a fixed-bias push-pull pair of 7591s on silicon rectifiers.

• Made in: USA
• Channels: 2
• Preamp tubes: 12AX7, 6GW8
• Power tubes: 2× 7591

Tags: american, vintage, reverb, tremolo, two-channel, clean.

Schematic-derived preset files for 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.