Hughes & Kettner Tube 20 - Clean preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Hughes & Kettner Tube 20 is a compact 1997 all-tube combo with two ECC83s and two EL84s. An op-amp and FET front end feeds relay-switched Clean and Lead channels: Clean has its own volume, Lead has gain with diode-limited drive and its own master, and both share treble, bass and middle. Spring reverb, an effects loop, a master and an ECC83 inverter driving fixed-bias EL84s follow, plus a DI output. Chimey, touch-sensitive breakup.

• Made in: Germany
• Wattage: 20W
• Channels: 2
• Preamp tubes: 2× ECC83
• Power tubes: 2× EL84

Tags: german, el84, low-wattage, crunch, two-channel.

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.