Magnatone 280 - Vibrato preset

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

The Magnatone 280 is the original version of Magnatone's stereo vibrato flagship, built by Magna Electronics in Inglewood, California. Its varistor-bridge vibrato shifts pitch rather than just volume, and it can be run in stereo through two separate push-pull pairs of 6CZ5s with their own output transformers. That true pitch vibrato is the reason players seek out the 280.

• Made in: USA
• Wattage: 20W
• Channels: 2
• Preamp tubes: 3× 12AX7, 3× 6CG7, 1× 12BH7
• Power tubes: 4× 6CZ5

Known for: Lonnie Mack, Buddy Holly.

Heard on: Memphis — Lonnie Mack (1963).

Tags: american, vintage, vibrato, stereo, two-channel.

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.