Jansen Bass 75 / Bass 50 - Channel 2 preset

Verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Bass 75 (and the related Bass 50) is a valve bass amp from Jansen of New Zealand. Each of its two channels has two inputs and an ECC83 used as two gain stages around its own treble, bass and volume. The channels mix into ECC82 stages with a preset gain control, then an ECC82 long-tailed-pair inverter drives two fixed-bias 7027A beam tetrodes from silicon-bridge supplies, with 4, 8 and 16-ohm taps. Rated 75 and 50 watts respectively.

• Made in: New Zealand
• Wattage: 75W
• Channels: 2
• Preamp tubes: 2× ECC83, 2× ECC82
• Power tubes: 2× 7027A

Tags: bass, vintage, 6l6, two-channel, high-wattage.

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.