What tubes does the Davoli UP35 EL500/EL504 Power Unit use?

The Davoli UP35 EL500/EL504 Power Unit uses 2× EL504 power tubes.

When was the Davoli UP35 EL500/EL504 Power Unit produced?

The Davoli UP35 EL500/EL504 Power Unit was produced 1966–1974.

Davoli UP35 EL500/EL504 Power Unit preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Davoli UP35 is a 35-watt modular power unit built around EL500/EL504 output tubes. Like all Davoli power units, it was designed for use within a modular stack alongside dedicated preamps, allowing Italian rehearsal rooms and clubs to configure systems to their specific wattage needs.

Years produced: 1966–1974
Made in: Italy
Wattage: 35W
Channels: 1
Power tubes: 2× 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.