What tubes does the Gibson 50/60/70/80 (1971) - LO use?

The Gibson 50/60/70/80 (1971) - LO uses 3× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Gibson 50/60/70/80 (1971) - LO produced?

The Gibson 50/60/70/80 (1971) - LO was produced 1950–1960.

Gibson 50/60/70/80 (1971) - LO preset

Close · 78/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

This schematic covers the GA-50 through GA-80 family of high-powered Gibson combos and heads from the 1950s. These large-format amps used four 6L6 output tubes for substantial clean headroom suited to professional and stage use. Multiple channels and tone controls allowed flexibility across jazz, country, and early rock and roll styles. The GA-50/60/70/80 series represents the pinnacle of 1950s Gibson amplifier engineering and is a benchmark for warm, powerful American clean tones.

Years produced: 1950–1960
Made in: USA
Wattage: 50W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 4× 6L6

Tags: american, clean, vintage.

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.