Guild 98RT preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 98RT is a Guild combo built to late 1962 whose circuit is closely based on the Ampeg Reverberocket R-12-R. Three inputs feed a 6SL7 stage with volume and tone controls. Two 6SN7s drive and recover the reverb (called echo) with a level control and footswitch, and half of the first 6SL7 runs the tremolo with speed, intensity and a footswitch. A second 6SL7 splits phase for a cathode-biased push-pull pair of 6V6s on a 5Y3 rectifier.

• Made in: USA
• Channels: 1
• Preamp tubes: 2× 6SL7, 2× 6SN7
• Power tubes: 2× 6V6

Tags: american, vintage, 6v6, reverb, tremolo.

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.