What tubes does the Fender Pro Junior use?

The Fender Pro Junior uses 2× 12AX7A preamp tubes and 2× EL84 power tubes.

When was the Fender Pro Junior produced?

The Fender Pro Junior was produced 1993–present.

Fender Pro Junior preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Pro Junior is Fender's simplest valve combo, first drawn in 1993: one input, a 12AX7A gain stage, a Volume control, then a Tone control and a second 12AX7A stage. Another 12AX7A is the long-tail phase inverter, with feedback from the speaker, driving a push-pull pair of fixed-bias EL84s from a silicon-diode supply into a 10-inch speaker. It gets to a warm, natural breakup quickly and responds well to pick attack and the guitar's volume knob.

Years produced: 1993–present
Wattage: 15W
Channels: 1
Preamp tubes: 2× 12AX7A
Power tubes: 2× EL84

Tags: el84, 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.