What tubes does the Hiwatt Sta 100 200 Preamp use?

The Hiwatt Sta 100 200 Preamp uses 4× ECC83 preamp tubes.

When was the Hiwatt Sta 100 200 Preamp produced?

The Hiwatt Sta 100 200 Preamp was produced 1970s–1980s.

Hiwatt Sta 100 200 Preamp preset

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

Preamp schematic for the Hiwatt STA100 and STA200 studio monitor amplifiers. ECC83-based preamp provides the clean, transparent input amplification characteristic of the Hiwatt STA studio series.

Years produced: 1970s–1980s
Made in: UK
Channels: 1
Preamp tubes: 4× ECC83

Tags: british, clean, studio, sub-circuit.

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.