Dynaco ST-35 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Dynaco ST-35 is a small tube hi-fi stereo power amplifier, not a guitar amp. Each side has a 7247 driver and two 6BQ5 (EL84) output tubes in push-pull for about 17.5 watts per side, with a solid-state rectifier. Its compact EL84 output stages make it a popular base for guitar power-amp conversions.

• Made in: USA
• Wattage: 35W
• Channels: 1
• Preamp tubes: 2× 7247
• Power tubes: 4× 6BQ5/EL84

Tags: american, vintage, el84, stereo, power-amp, mid-wattage.

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.