What tubes does the Hiwatt T20 use?

The Hiwatt T20 uses 3× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Hiwatt T20 produced?

The Hiwatt T20 was produced 1970s–1980s.

Hiwatt T20 preset

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

The Hiwatt T20 is a compact 20-watt Hiwatt head built to the same high standards as the DR series. EL34 output tubes and careful engineering deliver the Hiwatt clean character at manageable volume.

Years produced: 1970s–1980s
Made in: UK
Wattage: 20W
Channels: 1
Preamp tubes: 3× ECC83
Power tubes: 2× EL34

Tags: british, clean, vintage, low-wattage.

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.