What tubes does the Fender Blues Junior III use?

The Fender Blues Junior III uses 3× 12AX7 preamp tubes and 2× EL84 power tubes.

When was the Fender Blues Junior III produced?

The Fender Blues Junior III was produced 2010–2018.

Fender Blues Junior III preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Blues Junior III is the third-generation Blues Junior, a 15-watt 1×12 combo. Two 12AX7 stages with a Volume control and a switchable Fat boost (panel or footswitch) feed a cathode follower and a Treble/Bass/Middle stack, then a Master. Reverb is driven and recovered by an op-amp rather than a valve. A 12AX7 long-tail phase inverter drives a cathode-biased pair of EL84s from a solid-state rectifier.

Years produced: 2010–2018
Wattage: 15W
Channels: 1
Preamp tubes: 3× 12AX7
Power tubes: 2× EL84

Tags: el84, reverb, breakup, clean, low-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.