What tubes does the Hiwatt 50W Sa115 use?

The Hiwatt 50W Sa115 uses 4× ECC83 (12AX7) preamp tubes and 2× EL34 power tubes.

When was the Hiwatt 50W Sa115 produced?

The Hiwatt 50W Sa115 was produced 1971–1981.

Hiwatt 50W Sa115 preset

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

The Hiwatt SA115 is a 50-watt combo fitted with a single 15-inch speaker, a configuration that tilts the DR504 circuit's inherently balanced frequency response toward extended bass reproduction. The larger driver adds depth and warmth to the characteristically clear Hiwatt midrange, making the SA115 suitable for bass guitar as well as guitar. Like all Hiwatt combos of the period, it was built to tour-ready standards with hand-wired internals and quality components, offering players the durability and sonic consistency associated with the company's flagship heads.

Years produced: 1971–1981
Made in: UK
Wattage: 50W
Channels: 2
Preamp tubes: 4× ECC83 (12AX7)
Power tubes: 2× 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.