What tubes does the Ampeg G-20 - Channel 2 Bright use?

The Ampeg G-20 - Channel 2 Bright uses 3× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg G-20 - Channel 2 Bright produced?

The Ampeg G-20 - Channel 2 Bright was produced 1963–1967.

Ampeg G-20 - Channel 2 Bright preset

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

The G-20 Channel 1 Bright schematic documents the treble-boosted input path of Ampeg's 20-watt Gemini-series guitar combo. The Bright input adds sparkle and clarity particularly beneficial for single-coil pickups. The warm 6L6 circuit provides clean American tone with good headroom for the model's power class.

Years produced: 1963–1967
Made in: USA
Wattage: 20W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 6L6

Tags: guitar, american, vintage, low-wattage, 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.