What tubes does the Sunn Sceptre 1971 use?

The Sunn Sceptre 1971 uses 4× 12AX7 preamp tubes and 4× 6550 power tubes.

When was the Sunn Sceptre 1971 produced?

The Sunn Sceptre 1971 was produced 1967–1972.

Sunn Sceptre 1971 preset

Close · 75/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Sunn Sceptre is a 100-watt tube head closely related to the 100S, part of Sunn's professional lineup in the late 1960s and early 1970s. Its 6550-driven output section delivers the defining Sunn clean sound, and it remains a highly collectible vintage amp.

Years produced: 1967–1972
Made in: USA
Wattage: 100W
Channels: 2
Preamp tubes: 4× 12AX7
Power tubes: 4× 6550

Tags: american, vintage, clean.

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.