What tubes does the Davoli 1100B EL504 Power Unit use?

The Davoli 1100B EL504 Power Unit uses 4× EL504 power tubes.

When was the Davoli 1100B EL504 Power Unit produced?

The Davoli 1100B EL504 Power Unit was produced 1967–1975.

Davoli 1100B EL504 Power Unit preset

Verified · 83/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Davoli 1100B EL504 Power Unit is the output section from the 1100B amplifier head, built around Italian EL504 output tubes. Davoli's 1100 series represented the professional flagship of their product line, and the B variant indicates a refined iteration of the original 1100 design.

Years produced: 1967–1975
Made in: Italy
Channels: 1
Power tubes: 4× EL504

Tags: vintage.

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.