What tubes does the Hiwatt Dr 504 Output use?

The Hiwatt Dr 504 Output uses 4× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Hiwatt Dr 504 Output produced?

The Hiwatt Dr 504 Output was produced 1970s–present.

Hiwatt Dr 504 Output preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

Output stage schematic for the Hiwatt DR504 50-watt head. The two-EL34 power section delivers the Hiwatt clean headroom in a more manageable 50-watt format.

Years produced: 1970s–present
Made in: UK
Wattage: 50W
Channels: 2
Preamp tubes: 4× ECC83
Power tubes: 2× EL34

Tags: british, clean, vintage, sub-circuit.

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.