Sundown A50 - Channel 1 preset

Verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Sundown A50 is a 1987 American two-channel head designed by Dennis Kager. Channel 1 has its own Gain 1 and High/Low tone network; channel 2 adds cascaded 12AX7A stages with Gain 2 and a pull boost, High 2, Mid (with pull switch), Low 2 and Master. Relays switch channels, with LED indicators. A 12AX7A drives a transformer-coupled spring reverb with its own Reverb control, and a 12AX7A long-tail inverter with Presence and feedback drives two fixed-bias 6L6GCs with an RMS power-scaling control. Silicon bridge supply, 4/8-ohm outputs.

• Made in: USA
• Wattage: 50W
• Channels: 2
• Preamp tubes: 5× 12AX7A
• Power tubes: 2× 6L6GC

Tags: american, mid-wattage, two-channel.

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.