What tubes does the Radford STA25 Renaissance - Normal use?

The Radford STA25 Renaissance - Normal uses 2× ECC83 preamp tubes and 2× EL34 power tubes.

When was the Radford STA25 Renaissance - Normal produced?

The Radford STA25 Renaissance - Normal was produced 1960–1975.

Radford STA25 Renaissance - Normal preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Radford STA25 Renaissance is a high-quality British tube amplifier from Arthur Radford's Bristol-based company, originally designed for hi-fi applications but well suited to guitar use. Radford amplifiers were renowned for their precise engineering, transformers of exceptional quality, and clean, detailed sound reproduction. The STA25 is highly regarded by audiophiles and guitarists alike for its refined, transparent tone.

Years produced: 1960–1975
Made in: UK
Wattage: 25W
Channels: 1
Preamp tubes: 2× ECC83
Power tubes: 2× EL34

Tags: british, vintage, clean.

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.