What tubes does the Dr. Z Jetta use?

The Dr. Z Jetta uses 2× 12AX7 preamp tubes and 2× 7591 power tubes.

When was the Dr. Z Jetta produced?

The Dr. Z Jetta was produced 2019–2025.

Dr. Z Jetta preset

Close · 62/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Dr. Z Jetta (ZA-49) is a 30-watt single-channel amp built around a pair of cathode-biased 7591 power tubes and a 5AR4 rectifier. A 12AX7 gain stage feeds Volume and Tone controls, then a 12AX7 long-tailed-pair phase inverter with a dual Master control on its outputs. Kept deliberately simple, the 7591s give a big, clear American clean that thickens into smooth drive.

Years produced: 2019–2025
Made in: USA
Wattage: 30W
Channels: 1
Preamp tubes: 2× 12AX7
Power tubes: 2× 7591

Tags: american, boutique, clean, breakup, mid-wattage.

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.