Watkins Joker Power 30 - Channel 2 preset

Close · 78/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The drawing is the Watkins Joker Power 30 drive unit, a valve amplifier with a built-in tape echo. Three inputs each have their own Tone and volume control and an Echo switch, mixed into a Master control. A tape loop with record and playback heads gives echo and reverb effects with Reverb and Swell controls and a footswitch, with an EM87 tuning-eye indicator. Four EL84s in push-pull drive the output transformer from an EZ81 rectifier.

• Made in: UK
• Wattage: 30W
• Channels: 3
• Preamp tubes: 5× ECC83, 1× 6BR8
• Power tubes: 4× EL84

Tags: british, vintage, el84, multi-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.