What tubes does the Hiwatt 200W Poweramp Sta250 use?

The Hiwatt 200W Poweramp Sta250 uses 2× ECC83 (12AX7) preamp tubes and 8× EL34 power tubes.

When was the Hiwatt 200W Poweramp Sta250 produced?

The Hiwatt 200W Poweramp Sta250 was produced 1972–1982.

Hiwatt 200W Poweramp Sta250 preset

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

The Hiwatt STA250 is a dedicated 200-watt power amplifier stage without an onboard preamp, designed to be driven by an external mixer or preamp for large-format PA and monitoring applications. Eight EL34 tubes deliver enormous headroom with the low distortion and high damping factor that characterized all Hiwatt designs of the era. Constructed with the same point-to-point military-spec wiring as the guitar amplifiers, the STA250 was prized for its rock-solid reliability over extended touring seasons and its ability to reproduce transients cleanly at massive output levels.

Years produced: 1972–1982
Made in: UK
Wattage: 200W
Channels: 1
Preamp tubes: 2× ECC83 (12AX7)
Power tubes: 8× EL34

Tags: british, clean, vintage.

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.