What tubes does the Gregory Mark X - Main use?

The Gregory Mark X - Main uses 2× 12AX7 preamp tubes and 2× 6V6 power tubes.

When was the Gregory Mark X - Main produced?

The Gregory Mark X - Main was produced 1960–1968.

Gregory Mark X - Main preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

Gregory amplifiers were American-made budget tube combos of the early 1960s, sold through department stores and music retailers to beginning guitarists. The Mark X offered a straightforward clean American tube tone characteristic of the era's low-cost instrument market.

Years produced: 1960–1968
Made in: USA
Channels: 2
Preamp tubes: 2× 12AX7
Power tubes: 2× 6V6

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.