Sheriff800

The Sheriff800 target is the Master Volume Lead family. It is a real-time graybox topology, not a component-exact SPICE model.

Circuit Diagram

Diagram data lives in knowledge/models/amps/diagrams/sheriff800.diagram.json5.

This JSON5 graph is a documentation and renderer artifact. It maps the cascaded preamp, cold clipper, tone stack, master, and power section to the current Rust emulation.

Circuit graph

Sheriff800 documentation graph

documentationrust-model

Extracted Topology

Input:

• High-sensitivity input into cascaded ECC83 / 12AX7 preamp stages.
• Tight high-pass coupling before the preamp gain path.

Preamp:

• Cascaded gain stages with bright preamp-volume behavior.
• Cold-biased clipping-stage behavior is part of the family sound.
• Current graybox target uses asymmetric triode stages with cathode-bypass high-pass emphasis.

Tone stack:

• TMB passive network family.
• Treble cap target: 470 pF.
• Bass cap target: 22 nF.
• Mid cap target: 22 nF.
• Slope resistor target: 33 kOhm.
• Controls: bass, middle, treble.
• Current model retunes the existing passive MNA stack; middle is still approximated as level into the stack.

Master volume:

• Pre-phase-inverter master volume.
• Current implementation handles this through standalone gain staging and output trim.

Phase inverter and power amp:

• ECC83 / 12AX7 long-tail-pair phase inverter.
• Fixed-bias push-pull EL34 output stage.
• EL34 fixed-bias output stage family.
• Negative feedback with presence control.
• Output stage target includes current compression, dynamic bias shift, supply sag, and transformer high-pass/low-pass behavior.

Modeling Notes

The Sheriff800 model should remain a family target until a specific unit/reference is chosen. The cold-clipper and pre-phase-inverter master-volume behavior are more important to preserve than exact component labels in early graybox passes.

Source Notes

Useful references include public schematic indexes, public tone-stack analysis, and manufacturer reissue descriptions. Do not commit scans or copyrighted service documents; keep only extracted topology and confidence notes.