What tubes does the Ampeg Ampeg Preamp (1940) - Triode Channel use?

The Ampeg Ampeg Preamp (1940) - Triode Channel uses 2× triode preamp tubes.

When was the Ampeg Ampeg Preamp (1940) - Triode Channel produced?

The Ampeg Ampeg Preamp (1940) - Triode Channel was produced 1940–1945.

Ampeg Ampeg Preamp (1940) - Triode Channel preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

This extremely rare 1940 Ampeg preamp schematic documents one of the earliest known Ampeg circuits, predating the company's guitar and bass amplifier products. The triode channel uses vintage vacuum tube technology for instrument preamplification. A historically significant document from the early years of electric instrument amplification.

Years produced: 1940–1945
Made in: USA
Channels: 1
Preamp tubes: 2× triode

Tags: american, vintage, preamp, 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.