What tubes does the Engl Fireball 25 E633 use?

The Engl Fireball 25 E633 uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

Who famously used the Engl Fireball 25 E633?

Woody Weatherman are among the notable players associated with the Engl Fireball 25 E633.

Engl Fireball 25 E633 preset

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

The Fireball 25 (E633) is a 25-watt ENGL head that fits the Fireball's high-gain voice into a small amp. One input feeds cascaded preamp triodes on three valves, with a relay that switches the gain path between clean and lead voicings and a second relay that selects between two master volumes. An effects loop sits between the tone stage and the masters, and a long-tailed-pair inverter drives a pair of 6L6s.

Made in: Germany
Wattage: 25W
Channels: 1
Preamp tubes: 3× 12AX7
Power tubes: 2× 6L6

Known for: Woody Weatherman.

Tags: german, high-gain, metal, 6l6, mid-wattage, modern.

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.