What tubes does the Ampeg Vt 40 Rev D use?

The Ampeg Vt 40 Rev D uses 4× 12AX7 preamp tubes and 4× 6L6 power tubes.

When was the Ampeg Vt 40 Rev D produced?

The Ampeg Vt 40 Rev D was produced 1973–1978.

Ampeg Vt 40 Rev D preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The VT-40 Rev D schematic is a duplicate reference documenting the same late-production revision of Ampeg's 100-watt guitar combo. Rev D represents the optimized, mature version of the VT-40 circuit with all accumulated factory improvements incorporated.

Years produced: 1973–1978
Made in: USA
Wattage: 100W
Channels: 2
Preamp tubes: 4× 12AX7
Power tubes: 4× 6L6

Tags: guitar, american, vintage, mid-wattage, reverb.

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.