Echolette M 150 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Echolette M 150 of 1974 is a German hybrid PA head. Five identical input modules, each built on an op-amp and transistor stages with its own volume and EQ, feed a transistor master board with an echo send and return. A valve power board then uses one ECC81 as voltage amplifier and cathodyne inverter to drive two fixed-bias EL34s in push-pull with negative feedback, on a silicon-rectified supply with a standby switch.

• Made in: Germany
• Channels: 1
• Preamp tubes: 1× ECC81
• Power tubes: 2× EL34

Tags: german, vintage, hybrid, el34, clean.

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.