Dr. Z Route 66 preset

Close · 60/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Dr. Z Route 66 is a 32-watt single-channel amp built around a pair of KT66 power tubes, an EF86 pentode input stage and a 12AX7 long-tailed-pair phase inverter, with a 5AR4 rectifier and adjustable fixed bias. With no negative feedback and only Volume, Bass and Treble controls, it gives a raw, open, touch-sensitive tone with a lot of harmonic complexity.

• Made in: USA
• Wattage: 32W
• Channels: 1
• Preamp tubes: 1× EF86, 1× 12AX7
• Power tubes: 2× KT66

Tags: american, kt66, mid-wattage, boutique, breakup.

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.