What tubes does the Hiwatt Custom 20 Tube use?

The Hiwatt Custom 20 Tube uses 3× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Hiwatt Custom 20 Tube produced?

The Hiwatt Custom 20 Tube was produced 1980s–present.

Hiwatt Custom 20 Tube preset

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

Tube stage schematic for the Hiwatt Custom 20. Documents the ECC83 preamp and EL34 output stages of this compact Hiwatt head, built to the same standards as the flagship DR103.

Years produced: 1980s–present
Made in: UK
Wattage: 20W
Channels: 1
Preamp tubes: 3× 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.