Carlsbro CS60 PA preset

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

The Carlsbro CS60 PA is a 60-watt valve PA head with three ECC83s and a push-pull pair of EL34s. Four inputs, each with its own 500K volume, are mixed in pairs onto the two halves of the first ECC83; a second ECC83 provides gain stages around a shared tone network and master volume, with take-off points for an external reverb. An ECC83 long-tail phase inverter drives the fixed-bias EL34s from a silicon rectifier, into 3.75, 7.5 and 15 ohm taps.

• Made in: UK
• Wattage: 60W
• Channels: 1
• Preamp tubes: 3× ECC83
• Power tubes: 2× EL34

Tags: british, el34, reverb, 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.