London Electric Model 8 preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The London Electric Model 8 is a small mid-1960s AC/DC practice amp with a 12AU6 pentode preamp, a single-ended 50C5 output tube and a 35W4 rectifier, driving an 8-inch speaker at a couple of watts. It has volume and tone plus a tremolo with speed and depth, driven by a 12AV6 phase-shift oscillator. It breaks up quickly into a small, fuzzy tone.

• Wattage: 2W
• Channels: 1
• Preamp tubes: 1× 12AU6, 1× 12AV6
• Power tubes: 1× 50C5

Tags: vintage, practice, tremolo, 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.