What tubes does the Ampeg Echo Twin ET-1B - Main use?

The Ampeg Echo Twin ET-1B - Main uses 4× 12AX7 preamp tubes and 2× 6L6 power tubes.

When was the Ampeg Echo Twin ET-1B - Main produced?

The Ampeg Echo Twin ET-1B - Main was produced 1963–1967.

Ampeg Echo Twin ET-1B - Main preset

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

Schematic for the Ampeg ET-1B Echo Twin guitar combo — a variant of the ET-1 with circuit or cosmetic updates. Like the standard ET-1, the ET-1B combined a clean all-tube guitar amplifier with built-in echo capability, offering period guitarists a self-contained solution for producing the echo-drenched tones of 1960s guitar music. The B suffix indicates a revised circuit version.

Years produced: 1963–1967
Made in: USA
Wattage: 30W
Channels: 2
Preamp tubes: 4× 12AX7
Power tubes: 2× 6L6

Tags: american, vintage, 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.