Rock-Ola Model B preset

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

An early Rock-Ola jukebox amplifier. A 6A6 twin triode drives a push-pull pair of 6B5 output tubes, with a 5Z3 rectifier and a field-coil speaker whose winding doubles as the filter choke. The circuit has only volume and tone controls.

• Made in: USA
• Channels: 1
• Preamp tubes: 1× 6A6
• Power tubes: 2× 6B5

Tags: american, vintage, clean.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.