Standel PR5B / PR5R Master Control - Bass/Reverb/Vibrato preset

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

The Standel PR5B and PR5R Master Control (1968) is the solid-state preamp and control section for Standel's PR5 series, feeding a separate power stage through a signal output. A Normal input and a Bass/Reverb-Vibrato input each run through their own potted module with their own Volume, Treble, Contour and Bass. The PR5R adds a vibrato module with Intensity, Speed and footswitch and a transistor-driven spring reverb with Reverb level and footswitch; the PR5B omits them.

• Made in: USA
• Channels: 2

Tags: american, vintage, solid-state, preamp, reverb, vibrato, two-channel.

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.