{
  "format": "circuit-codex-reference",
  "version": 1,
  "id": "5e3",
  "url": "https://circuitcodex.com/amps/5e3/",
  "attribution": "The Analog Maker / Circuit Codex",
  "license": "https://creativecommons.org/licenses/by-sa/4.0/",
  "revision": "ebddc3fd2cf887dca010bbe60487d7391ea6c052",
  "scope": "DC and drawing checks have separate coverage. See included check results and the circuit page; not a dimensioned build template or a physical-build certification.",
  "metadata": {
    "id": "5e3",
    "name_style": "Tweed Deluxe-style",
    "family": "tweed",
    "era": {
      "start": 1955,
      "end": 1960
    },
    "wattage": 15,
    "tubes": [
      "12AY7",
      "12AX7",
      "6V6GT",
      "6V6GT",
      "5Y3GT"
    ],
    "topology": {
      "rectifier": {
        "kind": "tube",
        "type": "5Y3GT"
      },
      "bias": "cathode",
      "phase_inverter": "cathodyne",
      "tone_stack": "single-knob"
    },
    "lineage": {
      "derived_from": [
        "5d3"
      ],
      "influenced": [
        "6g3"
      ]
    },
    "conventions": {
      "designators": "functional"
    },
    "sources": [
      {
        "desc": "Fender 'Deluxe' Model 5E3 drawing (F-EE): all component values read directly from the published schematic/layout (2026-07-18) — incl. the cathodyne bias arrangement (1M grid leak to the 1.5k/56k cathode junction) and rail droppers 5k + 22k; the wiper-fed volume pair, the tone network on the V2A grid, the V2A-plate coupler (value not legible) and the four input jacks re-read in the 2026-10-03 source audit. The drawing carries no voltage chart. Not reproduced here; archived at EL34World",
        "url": "https://el34world.com/charts/Schematics/files/Fender/Fender_deluxe_5e3.pdf"
      },
      {
        "desc": "Rob Robinette, 'How the 5E3 Deluxe Works' — published DC measurements used as the verification reference in lieu of a factory chart (B+ 370/295/250; stage drops 110/83/47 V; 6V6 cathode 19 V)",
        "url": "https://robrobinette.com/How_The_5E3_Deluxe_Works.htm"
      },
      {
        "desc": "Fender 'Deluxe' 5E3 layout drawing (F-EE), page 1 — the source for the order the board-layout drawing on this page places parts on the eyelet board. Redrawn from the published facts, never traced",
        "url": "https://el34world.com/charts/Schematics/files/Fender/Fender_deluxe_5e3.pdf"
      }
    ],
    "verification": {
      "status": "verified",
      "date": "2026-07-18T00:00:00.000Z",
      "max_deviation_pct": 12.9
    },
    "contributors": [
      "TheAnalogMaker"
    ]
  },
  "parts": {
    "notes": "Each channel has two input jacks, each through its own 68 kΩ into the grid, with the channel's 1 MΩ leak from jack 1's tip to ground, as F-EE draws it on both pages; the jacks themselves and their normalling contacts are not listed. Dropper wattages are not marked on the drawing.",
    "items": [
      {
        "ref": "R1s",
        "part": "Carbon comp resistor",
        "value": "68 kΩ · ½ W",
        "role": "Instrument grid stopper (jack 1)"
      },
      {
        "ref": "R1s2",
        "part": "Carbon comp resistor",
        "value": "68 kΩ · ½ W",
        "role": "Instrument grid stopper (jack 2)"
      },
      {
        "ref": "R2s",
        "part": "Carbon comp resistor",
        "value": "68 kΩ · ½ W",
        "role": "Mic grid stopper (jack 1)"
      },
      {
        "ref": "R2s2",
        "part": "Carbon comp resistor",
        "value": "68 kΩ · ½ W",
        "role": "Mic grid stopper (jack 2)"
      },
      {
        "ref": "RG1",
        "part": "Carbon comp resistor",
        "value": "1 MΩ · ½ W",
        "role": "Instrument input leak, jack 1's tip to ground (the V1A grid returns through R1s)"
      },
      {
        "ref": "RG2",
        "part": "Carbon comp resistor",
        "value": "1 MΩ · ½ W",
        "role": "Mic input leak, jack 1's tip to ground (the V1B grid returns through R2s)"
      },
      {
        "ref": "RL1",
        "part": "Carbon comp resistor",
        "value": "100 kΩ · ½ W",
        "role": "V1A plate load"
      },
      {
        "ref": "RL2",
        "part": "Carbon comp resistor",
        "value": "100 kΩ · ½ W",
        "role": "V1B plate load"
      },
      {
        "ref": "RK1",
        "part": "Carbon comp resistor",
        "value": "820 Ω · ½ W",
        "role": "Shared 12AY7 cathode bias"
      },
      {
        "ref": "C10",
        "part": "Electrolytic capacitor",
        "value": "25 µF · 25 V",
        "role": "Shared 12AY7 cathode bypass"
      },
      {
        "ref": "C1",
        "part": "Coupling capacitor",
        "value": "0.1 µF · 400 V",
        "role": "V1A → instrument volume's wiper"
      },
      {
        "ref": "C2",
        "part": "Coupling capacitor",
        "value": "0.1 µF · 400 V",
        "role": "V1B → mic volume's wiper"
      },
      {
        "ref": "VR1",
        "part": "Audio-taper potentiometer",
        "value": "1 MΩ",
        "role": "Instrument volume: fed on its wiper; one end to ground, the other to the V2A grid line"
      },
      {
        "ref": "VR2",
        "part": "Audio-taper potentiometer",
        "value": "1 MΩ",
        "role": "Mic volume: fed on its wiper; one end to ground, the other to the V2A grid line"
      },
      {
        "ref": "RL3",
        "part": "Carbon comp resistor",
        "value": "100 kΩ · ½ W",
        "role": "V2A plate load"
      },
      {
        "ref": "RK2",
        "part": "Carbon comp resistor",
        "value": "1.5 kΩ · ½ W",
        "role": "V2A cathode bias"
      },
      {
        "ref": "C4",
        "part": "Electrolytic capacitor",
        "value": "25 µF · 25 V",
        "role": "V2A cathode bypass"
      },
      {
        "ref": "C3",
        "part": "Capacitor",
        "value": "value not legible",
        "role": "V2A plate → cathodyne grid coupler. The schematic draws it with no value; the layout letters it \".02 .1FD. 600 VOLTS\", an overwritten revision whose digit cannot be decided (.02 or .1 µF), so no value is given. 600 V on the layout. DC-open, so not in the DC model"
      },
      {
        "ref": "C5",
        "part": "Mica capacitor",
        "value": "500 pF",
        "role": "Tone: instrument volume's wiper → tone pot end"
      },
      {
        "ref": "VR3",
        "part": "Audio-taper potentiometer",
        "value": "1 MΩ",
        "role": "Tone: track between the 500 pF and the 0.005 µF, wiper on the V2A grid line"
      },
      {
        "ref": "C6",
        "part": "Film capacitor",
        "value": "0.005 µF · 600 V",
        "role": "Tone: tone pot's other end → ground"
      },
      {
        "ref": "RL4",
        "part": "Carbon comp resistor",
        "value": "56 kΩ · ½ W",
        "role": "Cathodyne plate load"
      },
      {
        "ref": "RKA",
        "part": "Carbon comp resistor",
        "value": "1.5 kΩ · ½ W",
        "role": "Cathodyne bias (cathode → junction)"
      },
      {
        "ref": "RKB",
        "part": "Carbon comp resistor",
        "value": "56 kΩ · ½ W",
        "role": "Cathodyne cathode load (junction → ground)"
      },
      {
        "ref": "RGPI",
        "part": "Carbon comp resistor",
        "value": "1 MΩ · ½ W",
        "role": "Cathodyne grid leak, returned to the junction"
      },
      {
        "ref": "C7",
        "part": "Coupling capacitor",
        "value": "0.1 µF · 400 V",
        "role": "Cathodyne plate → V3 grid"
      },
      {
        "ref": "C8",
        "part": "Coupling capacitor",
        "value": "0.1 µF · 200 V",
        "role": "Cathodyne cathode → V4 grid"
      },
      {
        "ref": "R3s",
        "part": "Carbon comp resistor",
        "value": "1.5 kΩ · ½ W",
        "role": "V3 grid stopper"
      },
      {
        "ref": "R4s",
        "part": "Carbon comp resistor",
        "value": "1.5 kΩ · ½ W",
        "role": "V4 grid stopper"
      },
      {
        "ref": "RG6A",
        "part": "Carbon comp resistor",
        "value": "220 kΩ · ½ W",
        "role": "V3 grid leak"
      },
      {
        "ref": "RG6B",
        "part": "Carbon comp resistor",
        "value": "220 kΩ · ½ W",
        "role": "V4 grid leak"
      },
      {
        "ref": "RK66",
        "part": "Wirewound resistor",
        "value": "250 Ω · 5 W",
        "role": "Shared 6V6 cathode bias"
      },
      {
        "ref": "C9",
        "part": "Electrolytic capacitor",
        "value": "25 µF · 25 V",
        "role": "Shared 6V6 cathode bypass"
      },
      {
        "ref": "RD1",
        "part": "Power resistor",
        "value": "5 kΩ",
        "role": "Rail dropper B+1 → B+2"
      },
      {
        "ref": "RD2",
        "part": "Power resistor",
        "value": "22 kΩ",
        "role": "Rail dropper B+2 → B+3"
      },
      {
        "ref": "C11",
        "part": "Electrolytic capacitor",
        "value": "16 µF · 450 V",
        "role": "Filter, B+1"
      },
      {
        "ref": "C12",
        "part": "Electrolytic capacitor",
        "value": "16 µF · 450 V",
        "role": "Filter, B+2"
      },
      {
        "ref": "C13",
        "part": "Electrolytic capacitor",
        "value": "16 µF · 450 V",
        "role": "Filter, B+3"
      },
      {
        "ref": "V1",
        "part": "Preamp tube",
        "value": "12AY7",
        "role": "Both input stages (V1A/V1B)"
      },
      {
        "ref": "V2",
        "part": "Preamp tube",
        "value": "12AX7",
        "role": "Second stage + cathodyne (V2A/V2B)"
      },
      {
        "ref": "V3",
        "part": "Power tube",
        "value": "6V6GT",
        "role": "Push-pull output (upper)"
      },
      {
        "ref": "V4",
        "part": "Power tube",
        "value": "6V6GT",
        "role": "Push-pull output (lower)"
      },
      {
        "ref": "V5",
        "part": "Rectifier tube",
        "value": "5Y3GT",
        "role": "Full-wave rectifier (V5A/V5B)"
      },
      {
        "ref": "T2",
        "part": "Output transformer",
        "value": "8 kΩ : 8 Ω",
        "role": "Push-pull output"
      },
      {
        "ref": "—",
        "part": "Power transformer",
        "value": "325-0-325 V · 6.3 V · 5 V",
        "role": "HT + heaters + rectifier filament"
      }
    ]
  },
  "publishedVoltages": {
    "source": "Rob Robinette's published 5E3 DC measurements (B+ 370/295/250; stage drops 110/83/47 V; 6V6 cathode 19 V); F-EE drawing supplies all component values but no chart",
    "nodes": {
      "BP2": {
        "chart": 295,
        "tol_pct": 15,
        "note": "screens node (after the 5 kΩ dropper)"
      },
      "BP3": {
        "chart": 250,
        "tol_pct": 15,
        "note": "preamp node (after the 22 kΩ dropper)"
      },
      "PAY1": {
        "chart": 140,
        "tol_pct": 20,
        "note": "12AY7 plate — Robinette: 110 V drop across 100k from 250 V"
      },
      "PAY2": {
        "chart": 140,
        "tol_pct": 20,
        "note": "12AY7 plate (second channel)"
      },
      "P2A": {
        "chart": 167,
        "tol_pct": 20,
        "note": "12AX7 V2A plate — 83 V drop across 100k"
      },
      "PPI": {
        "chart": 203,
        "tol_pct": 20,
        "note": "cathodyne plate — 47 V drop across 56k"
      },
      "KPI": {
        "chart": null,
        "note": "informational — cathodyne cathode (self-biased via 1.5 kΩ/56 kΩ stack)"
      },
      "JPI": {
        "chart": null,
        "note": "informational — grid-leak return junction"
      },
      "KAY": {
        "chart": null,
        "note": "informational — shared 12AY7 cathode"
      },
      "K2A": {
        "chart": null,
        "note": "informational — V2A cathode (1.5 k bias)"
      },
      "K66": {
        "chart": 19,
        "tol_pct": 20,
        "note": "shared 6V6 cathode, 250 Ω 5 W"
      }
    }
  },
  "operatingPoint": [
    {
      "node": "BP2",
      "chart": 295,
      "sim": 319.216,
      "disputed": false,
      "dev_pct": 8.208813559322037,
      "tol_pct": 15,
      "gated": true,
      "within": true,
      "note": "screens node (after the 5 kΩ dropper)",
      "dispute_note": ""
    },
    {
      "node": "BP3",
      "chart": 250,
      "sim": 234.159,
      "disputed": false,
      "dev_pct": 6.336400000000003,
      "tol_pct": 15,
      "gated": true,
      "within": true,
      "note": "preamp node (after the 22 kΩ dropper)",
      "dispute_note": ""
    },
    {
      "node": "PAY1",
      "chart": 140,
      "sim": 121.988,
      "disputed": false,
      "dev_pct": 12.865714285714287,
      "tol_pct": 20,
      "gated": true,
      "within": true,
      "note": "12AY7 plate — Robinette: 110 V drop across 100k from 250 V",
      "dispute_note": ""
    },
    {
      "node": "PAY2",
      "chart": 140,
      "sim": 121.988,
      "disputed": false,
      "dev_pct": 12.865714285714287,
      "tol_pct": 20,
      "gated": true,
      "within": true,
      "note": "12AY7 plate (second channel)",
      "dispute_note": ""
    },
    {
      "node": "P2A",
      "chart": 167,
      "sim": 151.524,
      "disputed": false,
      "dev_pct": 9.267065868263472,
      "tol_pct": 20,
      "gated": true,
      "within": true,
      "note": "12AX7 V2A plate — 83 V drop across 100k",
      "dispute_note": ""
    },
    {
      "node": "PPI",
      "chart": 203,
      "sim": 189.559,
      "disputed": false,
      "dev_pct": 6.621182266009853,
      "tol_pct": 20,
      "gated": true,
      "within": true,
      "note": "cathodyne plate — 47 V drop across 56k",
      "dispute_note": ""
    },
    {
      "node": "KPI",
      "chart": null,
      "sim": 45.795,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — cathodyne cathode (self-biased via 1.5 kΩ/56 kΩ stack)",
      "dispute_note": ""
    },
    {
      "node": "JPI",
      "chart": null,
      "sim": 44.6,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — grid-leak return junction",
      "dispute_note": ""
    },
    {
      "node": "KAY",
      "chart": null,
      "sim": 1.84,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — shared 12AY7 cathode",
      "dispute_note": ""
    },
    {
      "node": "K2A",
      "chart": null,
      "sim": 1.24,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — V2A cathode (1.5 k bias)",
      "dispute_note": ""
    },
    {
      "node": "K66",
      "chart": 19,
      "sim": 20.456,
      "disputed": false,
      "dev_pct": 7.66315789473684,
      "tol_pct": 20,
      "gated": true,
      "within": true,
      "note": "shared 6V6 cathode, 250 Ω 5 W",
      "dispute_note": ""
    }
  ],
  "checks": [
    {
      "id": "dc",
      "title": "DC operating point",
      "status": "Verified",
      "summary": "7 reference nodes are within tolerance. Maintainer verification is recorded for 2026-07-18; changes since then are awaiting maintainer re-review.",
      "details": [
        "The circuit's facts (netlist, reference voltages, parts list, both drawings' connections, capacitor polarity marks and heater declarations) have changed since the maintainer's review, or no review fingerprint is on record yet. The badge stands on its date until the maintainer re-reviews.",
        "This compares simulated DC conditions with the cited reference. It does not test sound, physical construction or every part of the circuit."
      ],
      "tone": "checked"
    },
    {
      "id": "schematic",
      "title": "Schematic against DC model",
      "status": "Checked",
      "summary": "Connectivity of modelled components is checked on every change.",
      "details": [
        "Parts outside the DC model need separate checks and source review."
      ],
      "tone": "checked"
    },
    {
      "id": "board",
      "title": "Board against DC model",
      "status": "Checked",
      "summary": "Connectivity of modelled components is checked on every change.",
      "details": [
        "This does not establish heater wiring or physical spacing."
      ],
      "tone": "checked"
    },
    {
      "id": "drawings",
      "title": "Schematic against board",
      "status": "No open findings",
      "summary": "No disagreement is listed in the published comparison.",
      "details": [
        "A finding identifies a difference or a coverage gap. The factory source must decide which drawing, if either, needs correction.",
        "2 sheet-only parts are explicitly excluded: R3s, R4s. Heaters and the pilot lamp are checked separately."
      ],
      "tone": "checked"
    },
    {
      "id": "heaters",
      "title": "Heater and filament wiring",
      "status": "Checked",
      "summary": "The declared heater circuits cover the drawing and pass their separate wiring check.",
      "details": [],
      "tone": "checked"
    },
    {
      "id": "polarity",
      "title": "Capacitor polarity",
      "status": "Checked",
      "summary": "6 capacitor markings agree with the model's voltage ordering.",
      "details": [
        "This check uses DC voltage ordering; source review establishes markings the model cannot decide."
      ],
      "tone": "checked"
    }
  ],
  "corrections": [
    {
      "id": "5e3-preamp-network-2026-10-03",
      "date": "2026-10-03",
      "amps": [
        "5e3"
      ],
      "title": "5E3 volume, tone and input wiring",
      "description": "The schematic and board now wire the two volume controls the way the factory drawing does, with each preamp coupling capacitor feeding the control's wiper and the second stage's grid taken from the joined ends of the two tracks. The single tone control has moved from between the second stage and the phase inverter to the second stage's input, between the instrument volume's wiper and ground, with its wiper on that grid line. The coupling capacitor from the second stage to the phase inverter is now shown. Its value is not given because the drawing's marking cannot be read. Each channel now has its two input jacks, each with its own 68 kΩ resistor, and the channel's 1 MΩ resistor sits at the first jack. The simulated operating points are unchanged, and the circuit's verification status is unchanged.",
      "commit": "64249e939108599ff46f46bc49aa442d67091b87",
      "url": "https://github.com/TheAnalogMaker/circuit-codex/commit/64249e939108599ff46f46bc49aa442d67091b87"
    }
  ],
  "sourceDirectory": "https://github.com/TheAnalogMaker/circuit-codex/tree/ebddc3fd2cf887dca010bbe60487d7391ea6c052/amps/5e3"
}