What tubes does the Sundown SD-1012C / SD-1000H - Clean use?

The Sundown SD-1012C / SD-1000H - Clean uses 5× 12AX7A preamp tubes and 4× 6L6GC power tubes.

Who famously used the Sundown SD-1012C / SD-1000H - Clean?

John Scofield are among the notable players associated with the Sundown SD-1012C / SD-1000H - Clean.

Sundown SD-1012C / SD-1000H - Clean preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Sundown SD-1012C combo and SD-1000H head (1985) are the 100-watt version of Sundown's two-channel design. Channel 1 has its own Gain 1 and High/Low tone network; channel 2 adds cascaded 12AX7A stages with Gain 2 and pull boost, High 2, Mid (with pull switch), Low 2 and Master, switched by relays with LED indicators. A 12AX7A drives a transformer-coupled spring reverb with a Reverb control. A 12AX7A long-tail inverter with Presence and feedback drives four fixed-bias 6L6GCs with an RMS power-scaling control, from a silicon bridge supply.

Made in: USA
Wattage: 100W
Channels: 2
Preamp tubes: 5× 12AX7A
Power tubes: 4× 6L6GC

Known for: John Scofield.

Tags: american, 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.