What tubes does the Hiwatt 400W Dr405 use?

The Hiwatt 400W Dr405 uses 4× ECC83 (12AX7) preamp tubes and 16× EL34 power tubes.

When was the Hiwatt 400W Dr405 produced?

The Hiwatt 400W Dr405 was produced 1973–1981.

Who famously used the Hiwatt 400W Dr405?

Pete Townshend are among the notable players associated with the Hiwatt 400W Dr405.

Hiwatt 400W Dr405 preset

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

The Hiwatt DR405 is among the most powerful valve amplifiers ever produced for stage use, pushing 400 watts through an array of sixteen EL34 output tubes. Conceived for the largest stadium and festival stages of the 1970s, the DR405 was handwired to the same uncompromising military-grade standards as every Hiwatt, representing an extraordinary feat of high-voltage engineering. At this power level the amplifier operates with essentially infinite clean headroom for any practical stage application, producing a sound of almost mechanical precision — every note defined, every harmonic accounted for, with zero compression or sag.

Years produced: 1973–1981
Made in: UK
Wattage: 400W
Channels: 2
Preamp tubes: 4× ECC83 (12AX7)
Power tubes: 16× EL34

Known for: Pete Townshend.

Tags: british, clean, 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.