Heathkit W-7M preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The W-7M is a Heathkit 55-watt mono hi-fi power amplifier kit, not a guitar amp. A 6AN8 pentode amplifier and triode split-load inverter drive a push-pull pair of EL34s from a silicon-diode power supply, and a damping selector adjusts how it controls the speaker. A clean, high-headroom EL34 power amp.

• Made in: USA
• Wattage: 55W
• Channels: 1
• Preamp tubes: 1× 6AN8
• Power tubes: 2× EL34

Tags: american, vintage, clean, el34, power-amp, high-wattage, diy.

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.