Selmer Treble 'n' Bass 50 SV Reverb - Normal preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Treble 'n' Bass 50 SV Reverb has Bass and Normal channels, each with an ECC83 gain stage, passive treble/bass stack and volume, and adds transformer-driven spring reverb on the Normal channel. An ECC83 long-tail inverter with a presence control drives two fixed-bias EL34s at about 445 V from a silicon rectifier.

• Made in: UK
• Wattage: 50W
• Channels: 2
• Power tubes: 2× EL34

Tags: british, vintage, el34, reverb, mid-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.