Carlsbro CS100/8 PA preset

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

The Carlsbro CS100/8 PA is a 100-watt valve PA head. Its preamp stage is built four times: each has an ECC83 triode, its own volume and treble and bass network and a second triode, and the four outputs mix into a shared master volume with echo input and output sockets. An ECC83 long-tail phase inverter drives four fixed-bias EL34s into a 100 V line and 3.75, 7.5 and 15 ohm taps, from a silicon bridge rectifier with standby.

Tags: british, vintage, el34, high-wattage, clean.

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.