Ceriatone Hey What?! 504 OL - Bright preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Hey What?! 504 OL is Ceriatone's hand-wired take on the classic 50-watt British DR504 head, with four ECC83s, a pair of EL34s and a solid-state rectifier. The OL version adds an extra gain stage and pot over the standard 504, so alongside the stiff, loud clean headroom and Normal/Bright/Linked inputs it can reach thicker overdrive.

• Made in: Malaysia
• Wattage: 50W
• Channels: 2
• Preamp tubes: 4× ECC83
• Power tubes: 2× EL34

Tags: boutique, el34, mid-wattage, two-channel, clean, hand-wired.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.