What tubes does the Guild 50 J use?

The Guild 50 J uses 12AX7 preamp tubes and 6L6 power tubes.

When was the Guild 50 J produced?

The Guild 50 J was produced 1963–1968.

Guild 50 J preset

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

The Guild 50-J is a 50-watt tube amplifier from Guild's mid-1960s amplifier line, designed to pair with the company's jazz and hollowbody electric guitars. Guild amps of this period were well-constructed American tube designs offering clean, warm tones appropriate for jazz, country, and early rock and roll. The 50-J's output stage delivers substantial headroom for its era, making it a capable stage and studio instrument.

Years produced: 1963–1968
Made in: US
Wattage: 50W
Channels: 2
Preamp tubes: 12AX7
Power tubes: 6L6

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.