What tubes does the Radford Ma Sta15 use?

The Radford Ma Sta15 uses 2× ECC83 preamp tubes and 2× EL84 power tubes.

When was the Radford Ma Sta15 produced?

The Radford Ma Sta15 was produced 1960–1972.

Radford Ma Sta15 preset

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

The Radford STA15 is a 15-watt British tube amplifier from Arthur Radford of Bristol, designed for high-fidelity audio reproduction with exceptional transformer quality. Radford built a small range of meticulously engineered tube amplifiers that are now treasured by audiophiles for their neutral, detailed character. The STA15 uses EL84 output tubes and shares the company's reputation for precision engineering.

Years produced: 1960–1972
Made in: UK
Wattage: 15W
Channels: 1
Preamp tubes: 2× ECC83
Power tubes: 2× EL84

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.