What tubes does the Hiwatt Hwpre4 use?

The Hiwatt Hwpre4 uses 4× ECC83 preamp tubes.

When was the Hiwatt Hwpre4 produced?

The Hiwatt Hwpre4 was produced 1969–present.

Hiwatt Hwpre4 preset

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

Hiwatt DR103/DR504 preamp sub-circuit schematic (section 4). Final preamp section documenting the output of the ECC83 driver stage feeding the EL34 power section.

Years produced: 1969–present
Made in: UK
Channels: 2
Preamp tubes: 4× ECC83

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.