What tubes does the Marshall Major Bass 1978 - Normal use?

The Marshall Major Bass 1978 - Normal uses 2× ECC83, 1× ECC82 preamp tubes and 4× KT88 power tubes.

When was the Marshall Major Bass 1978 - Normal produced?

The Marshall Major Bass 1978 - Normal was produced 1967–1974.

Marshall Major Bass 1978 - Normal preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 1978 is the bass version of the 200-watt Marshall Major, shown here in its 1970 US form. Four inputs feed two ECC83 channels with their own volumes, mixed into a gain stage that drives the Treble, Middle and Bass stack straight from the plate, followed by a second gain stage. An ECC82 phase inverter with Presence drives four KT88s off a large silicon bridge supply into 4, 8 or 16 ohms, for huge, clean low-end headroom.

Years produced: 1967–1974
Made in: UK
Wattage: 200W
Channels: 2
Preamp tubes: 2× ECC83, 1× ECC82
Power tubes: 4× KT88

Tags: british, vintage, bass, kt88, high-wattage, two-channel.

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.