What tubes does the Univox U-50 - Channel 3 use?

The Univox U-50 - Channel 3 uses 12AX7, 12AX7 preamp tubes and EL34, EL34 power tubes.

When was the Univox U-50 - Channel 3 produced?

The Univox U-50 - Channel 3 was produced 1968–1973.

Univox U-50 - Channel 3 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Univox 50 is a compact 50-watt tube combo that distills Univox's British amp ambitions into a practical, medium-power format well-suited to studio and small-stage use. Its EL34 power section delivers natural compression and harmonically rich breakup at moderate volumes, and the British-voiced tone stack provides a chimey, singing character that responds dynamically to picking intensity. The straightforward two-channel layout and compact cabinet made the Univox 50 a popular affordable alternative to contemporaneous Vox and Marshall models. It is well-regarded among vintage amp collectors for its genuine all-tube British character at a fraction of the cost of the originals it emulated.

Years produced: 1968–1973
Made in: Japan
Wattage: 50W
Channels: 2
Preamp tubes: 12AX7, 12AX7
Power tubes: EL34, EL34

Tags: british.

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.