{
  "format": "circuit-codex-reference",
  "version": 1,
  "id": "5d3",
  "url": "https://circuitcodex.com/amps/5d3/",
  "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": "5d3",
    "name_style": "Wide-panel Tweed Deluxe-style",
    "family": "tweed",
    "era": {
      "start": 1954,
      "end": 1955
    },
    "wattage": 12,
    "tubes": [
      "12AY7",
      "12AX7",
      "6V6GT",
      "6V6GT",
      "5Y3GT"
    ],
    "topology": {
      "rectifier": {
        "kind": "tube",
        "type": "5Y3GT"
      },
      "bias": "cathode",
      "phase_inverter": "paraphase",
      "tone_stack": "single-knob"
    },
    "lineage": {
      "derived_from": [],
      "influenced": [
        "5e3"
      ]
    },
    "conventions": {
      "designators": "functional"
    },
    "sources": [
      {
        "desc": "Fender 'Deluxe' Model 5D3 drawing, schematic + layout sheets: every component value read directly from the published drawing (2026-08-02) — three input jacks (channel 1 a bare 1 MΩ leak, channel 2 two jacks each through a 68 kΩ stopper onto its own 1 MΩ leak), V1 12AY7 with 100 kΩ plate loads on a shared 820 Ω / 25 µF cathode, two 1 MΩ volume pots and the 1 MΩ tone control with its 0.005 µF and 500 pF caps, V2 12AX7 with 100 kΩ plate loads and separate 1.5 kΩ cathodes (V2A bypassed by 25 µF, V2B not), the self-balancing paraphase network (220 kΩ / 270 kΩ grid leaks meeting at V2B's grid and returning to ground through 56 kΩ) with 100 pF across the inverter plates, 0.05 µF / 600 V couplers throughout, a 6V6GT pair on a shared 250 Ω 5 W / 25 µF cathode with no grid stoppers, and a 5Y3GT into three 16 µF / 450 V filter nodes split by two 10 kΩ droppers. No negative-feedback loop. The drawing prints no voltage chart, only Fender's ±20 % measurement notice. Not reproduced here; archived at EL34World",
        "url": "https://el34world.com/charts/Schematics/files/Fender/Fender_deluxe_5d3.pdf"
      },
      {
        "desc": "Fender 'Deluxe' Model 5C3 drawing — the immediately preceding wide-panel Deluxe, whose layout sheet DOES print a voltage chart (+360 V reservoir, +308 V screens, +280 V preamp, +18 V across the 6V6 cathode resistor). Used only as the supply-rail reference the 5D3 sheet lacks: the two circuits share the power transformer class, 5Y3GT rectifier, 16/16/16 µF filter, both 10 kΩ droppers and the 6V6GT output pair on its 250 Ω 5 W cathode, while the preamp differs entirely (6SC7 pair vs 12AY7 + 12AX7). Not reproduced here; archived at EL34World",
        "url": "https://el34world.com/charts/Schematics/files/Fender/Fender_deluxe_5c3.pdf"
      },
      {
        "desc": "Fender 'Deluxe' Model 5D3 layout drawing, page 1 — the source for the order the board-layout diagram places parts on the eyelet board, and for the lead-by-lead wiring it draws. Redrawn from the published facts, never traced",
        "url": "https://el34world.com/charts/Schematics/files/Fender/Fender_deluxe_5d3.pdf"
      },
      {
        "desc": "Mojotone/Ampwares Fender field guide, 'Wide Panel Tweed Deluxe' — production window for the wide-panel Deluxe trio, the 5D3's one circuit change from the 5C3 (the negative-feedback loop is dropped), and the output figure: the guide gives the wide-panel Deluxe as 10-14 W, the band the 12 W recorded here sits in. The drawing itself prints no power rating",
        "url": "https://mojotone.com/blogs/fender-field-guide/fender-wide-panel-tweed-deluxe"
      }
    ],
    "verification": {
      "status": "draft"
    },
    "added": "2026-08-02T00:00:00.000Z",
    "contributors": [
      "TheAnalogMaker"
    ]
  },
  "parts": {
    "notes": "The 5D3 has three input jacks: one on channel 1 and two on channel 2. The drawing marks no resistor wattages except the 250 Ω 5 W cathode resistor, and prints no transformer impedances or part numbers. The output transformer is numbered T2 under the archive's convention — T1 the power transformer, T2 the output transformer — and no T1 appears because the sheet gives the power transformer neither a part number nor a designator, so it is listed without one.",
    "items": [
      {
        "ref": "RG1",
        "part": "Carbon comp resistor",
        "value": "1 MΩ · ½ W",
        "role": "Channel-1 input grid leak (no stopper on this jack)"
      },
      {
        "ref": "R2S",
        "part": "Carbon comp resistor",
        "value": "68 kΩ · ½ W",
        "role": "Channel-2 grid stopper, upper jack"
      },
      {
        "ref": "RG2",
        "part": "Carbon comp resistor",
        "value": "1 MΩ · ½ W",
        "role": "Channel-2 input grid leak, upper jack"
      },
      {
        "ref": "R3S",
        "part": "Carbon comp resistor",
        "value": "68 kΩ · ½ W",
        "role": "Channel-2 grid stopper, lower jack"
      },
      {
        "ref": "RG3",
        "part": "Carbon comp resistor",
        "value": "1 MΩ · ½ W",
        "role": "Channel-2 input grid leak, lower jack"
      },
      {
        "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": "C1",
        "part": "Electrolytic capacitor",
        "value": "25 µF · 25 V",
        "role": "Shared 12AY7 cathode bypass"
      },
      {
        "ref": "C2",
        "part": "Coupling capacitor",
        "value": "0.05 µF · 600 V",
        "role": "V1A → channel-1 volume"
      },
      {
        "ref": "C3",
        "part": "Coupling capacitor",
        "value": "0.05 µF · 600 V",
        "role": "V1B → channel-2 volume"
      },
      {
        "ref": "VR1",
        "part": "Potentiometer",
        "value": "1 MΩ",
        "role": "Channel-1 volume"
      },
      {
        "ref": "VR2",
        "part": "Potentiometer",
        "value": "1 MΩ",
        "role": "Channel-2 volume"
      },
      {
        "ref": "VR3",
        "part": "Potentiometer",
        "value": "1 MΩ",
        "role": "Tone"
      },
      {
        "ref": "C5",
        "part": "Mica capacitor",
        "value": "500 pF",
        "role": "Tone — treble path"
      },
      {
        "ref": "C6",
        "part": "Film capacitor",
        "value": "0.005 µF · 600 V",
        "role": "Tone — cut path to ground"
      },
      {
        "ref": "RL3",
        "part": "Carbon comp resistor",
        "value": "100 kΩ · ½ W",
        "role": "V2A driver 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": "RL4",
        "part": "Carbon comp resistor",
        "value": "100 kΩ · ½ W",
        "role": "V2B inverter plate load"
      },
      {
        "ref": "RK3",
        "part": "Carbon comp resistor",
        "value": "1.5 kΩ · ½ W",
        "role": "V2B cathode bias (unbypassed)"
      },
      {
        "ref": "C14",
        "part": "Mica capacitor",
        "value": "100 pF",
        "role": "Across the two inverter plates"
      },
      {
        "ref": "RPA",
        "part": "Carbon comp resistor",
        "value": "220 kΩ · ½ W",
        "role": "V3 grid leak, returned to the paraphase junction"
      },
      {
        "ref": "RPB",
        "part": "Carbon comp resistor",
        "value": "270 kΩ · ½ W",
        "role": "V4 grid leak, returned to the paraphase junction"
      },
      {
        "ref": "RPT",
        "part": "Carbon comp resistor",
        "value": "56 kΩ · ½ W",
        "role": "Paraphase junction → ground"
      },
      {
        "ref": "C7",
        "part": "Coupling capacitor",
        "value": "0.05 µF · 600 V",
        "role": "V2A plate → V3 grid"
      },
      {
        "ref": "C8",
        "part": "Coupling capacitor",
        "value": "0.05 µF · 600 V",
        "role": "V2B plate → V4 grid"
      },
      {
        "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": "10 kΩ",
        "role": "Rail dropper B+1 → B+2"
      },
      {
        "ref": "RD2",
        "part": "Power resistor",
        "value": "10 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": "Driver + paraphase inverter (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": "push-pull : 8 Ω",
        "role": "Push-pull output, with a second 8 Ω jack for an extra speaker; the drawing marks no impedances"
      },
      {
        "ref": "—",
        "part": "Power transformer",
        "value": "centre-tapped HT · 6.3 V · 5 V (voltages not marked)",
        "role": "HT + heaters + rectifier filament"
      }
    ]
  },
  "publishedVoltages": {
    "source": "Fender 5C3 layout drawing's printed chart (+360 V reservoir, +308 V screens, +280 V preamp, +18 V across the 6V6 cathode resistor), used for the shared output stage only. B+1 driven at 360 V; every downstream node derived.",
    "nodes": {
      "K66": {
        "chart": 18,
        "tol_pct": 20,
        "note": "shared 6V6GT cathode across 250 Ω 5 W — the one node the sibling 5C3 chart transfers to, the output stage being identical"
      },
      "BP2": {
        "chart": null,
        "note": "informational — screen node after the first 10 kΩ dropper; the 5C3 chart prints +308 V here, but its lighter preamp draw makes that a loose comparison, not a target"
      },
      "BP3": {
        "chart": null,
        "note": "informational — preamp node after the second 10 kΩ dropper; the 5C3 chart prints +280 V here, feeding two 6SC7s through 250 kΩ loads instead of this circuit's four 100 kΩ loads"
      },
      "PAY1": {
        "chart": null,
        "note": "informational — 12AY7 plate, channel 1"
      },
      "PAY2": {
        "chart": null,
        "note": "informational — 12AY7 plate, channel 2"
      },
      "KAY": {
        "chart": null,
        "note": "informational — shared 12AY7 cathode, 820 Ω"
      },
      "P2A": {
        "chart": null,
        "note": "informational — 12AX7 driver plate"
      },
      "K2A": {
        "chart": null,
        "note": "informational — driver cathode, 1.5 kΩ bypassed"
      },
      "P2B": {
        "chart": null,
        "note": "informational — paraphase inverter plate"
      },
      "K2B": {
        "chart": null,
        "note": "informational — inverter cathode, 1.5 kΩ unbypassed"
      },
      "GPI": {
        "chart": null,
        "note": "informational — paraphase junction (220 kΩ/270 kΩ meeting the 56 kΩ return); idles at 0 V with no grid-current model"
      }
    }
  },
  "operatingPoint": [
    {
      "node": "K66",
      "chart": 18,
      "sim": 16.757,
      "disputed": false,
      "dev_pct": 6.905555555555548,
      "tol_pct": 20,
      "gated": true,
      "within": true,
      "note": "shared 6V6GT cathode across 250 Ω 5 W — the one node the sibling 5C3 chart transfers to, the output stage being identical",
      "dispute_note": ""
    },
    {
      "node": "BP2",
      "chart": null,
      "sim": 268.793,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — screen node after the first 10 kΩ dropper; the 5C3 chart prints +308 V here, but its lighter preamp draw makes that a loose comparison, not a target",
      "dispute_note": ""
    },
    {
      "node": "BP3",
      "chart": null,
      "sim": 230.445,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — preamp node after the second 10 kΩ dropper; the 5C3 chart prints +280 V here, feeding two 6SC7s through 250 kΩ loads instead of this circuit's four 100 kΩ loads",
      "dispute_note": ""
    },
    {
      "node": "PAY1",
      "chart": null,
      "sim": 120.177,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — 12AY7 plate, channel 1",
      "dispute_note": ""
    },
    {
      "node": "PAY2",
      "chart": null,
      "sim": 120.177,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — 12AY7 plate, channel 2",
      "dispute_note": ""
    },
    {
      "node": "KAY",
      "chart": null,
      "sim": 1.808,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — shared 12AY7 cathode, 820 Ω",
      "dispute_note": ""
    },
    {
      "node": "P2A",
      "chart": null,
      "sim": 148.972,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — 12AX7 driver plate",
      "dispute_note": ""
    },
    {
      "node": "K2A",
      "chart": null,
      "sim": 1.222,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — driver cathode, 1.5 kΩ bypassed",
      "dispute_note": ""
    },
    {
      "node": "P2B",
      "chart": null,
      "sim": 148.972,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — paraphase inverter plate",
      "dispute_note": ""
    },
    {
      "node": "K2B",
      "chart": null,
      "sim": 1.222,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — inverter cathode, 1.5 kΩ unbypassed",
      "dispute_note": ""
    },
    {
      "node": "GPI",
      "chart": null,
      "sim": 0,
      "disputed": false,
      "dev_pct": null,
      "tol_pct": 5,
      "gated": false,
      "within": null,
      "note": "informational — paraphase junction (220 kΩ/270 kΩ meeting the 56 kΩ return); idles at 0 V with no grid-current model",
      "dispute_note": ""
    }
  ],
  "checks": [
    {
      "id": "dc",
      "title": "DC operating point",
      "status": "Within target",
      "summary": "1 reference node is within tolerance. The circuit remains a draft awaiting maintainer review.",
      "details": [
        "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.",
        "3 sheet-only parts are explicitly excluded: RG1, RG2, RG3. Heaters and the pilot lamp are checked separately."
      ],
      "tone": "checked"
    },
    {
      "id": "heaters",
      "title": "Heater and filament wiring",
      "status": "Not established",
      "summary": "The drawn supply-leg connections have not been established by this check.",
      "details": [
        "Supply-leg grouping still needs confirmation at V1, V2.",
        "V1: pins [4, 5] are one leg at 6.3 V and opposite legs at 12.6 V"
      ],
      "tone": "attention"
    },
    {
      "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": [],
  "sourceDirectory": "https://github.com/TheAnalogMaker/circuit-codex/tree/ebddc3fd2cf887dca010bbe60487d7391ea6c052/amps/5d3"
}