Hagstrom 39 preset

verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Hagstrom 39 is a simple Swedish valve amp with two inputs and tone (Ton), volume (Volym) and tremolo controls. One half of an ECC83 is the preamp and the other half a phase-shift tremolo oscillator. The triode sections of two ECL82s handle gain and phase splitting, and their pentode sections form a cathode-biased push-pull output with ultralinear screen taps, on an EZ80 rectifier. The 55 W on the drawing is mains consumption.

• Made in: Sweden
• Channels: 1
• Preamp tubes: 1× ECC83
• Power tubes: 2× ECL82

Tags: swedish, vintage, tremolo, low-wattage.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.