Supro Coronado 1690T - Channel 2 preset

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

The Supro Coronado 1690T (the drawing also covers the similar 1615T and 1695T) has two channels, each with Treble and Norm inputs into its own 12AX7 stage and its own Volume, mixed into a shared Tone control. A 12AX7 tremolo has Speed and Intensity with a footswitch. A third 12AX7 provides gain and the phase inverter for two cathode-biased 6L6GBs (6L6GCs in later versions) driving a pair of 10-inch speakers, with a 5V4G rectifier on early chassis and a 5U4 on later ones, plus a standby switch.

Known for: Jimmy Page.

Heard on: Communication Breakdown — Led Zeppelin (1969).

Tags: american, vintage, 6l6, tremolo, two-channel.

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.