{
  "format": "construct-scene",
  "version": 2,
  "id": "o3-revox-a77",
  "title": "ReVox A77 \u2014 reel-to-reel tape recorder",
  "subject": {
    "category": "machine",
    "accuracy": "approximate",
    "synthetic": false,
    "summary": "A ReVox A77 studio tape recorder with two 10.5-inch reels turning and quarter-inch tape threaded across three heads. Cabinet, reel diameter, tape speed, head count and control layout come from the maker's service manual and a collector's specification; axle spacing, pack radii and the head-cover-off presentation are traced from reference photographs. The tape ribbon is a fixed geometric path while the reels, capstan and pinch roller turn."
  },
  "units": "m",
  "seed": 77,
  "sources": [
    {
      "id": "request",
      "kind": "user_request",
      "title": "The user's request",
      "rights": "user_private"
    },
    {
      "id": "manual",
      "kind": "document",
      "title": "ReVox A77 Service Manual (front panel, tape path, head cover)",
      "rights": "reference_only"
    },
    {
      "id": "spec",
      "kind": "document",
      "title": "ReVox A77 performance specification (reeltoreel.de) and Museum of Magnetic Sound Recording A77 MK IV page",
      "rights": "reference_only"
    },
    {
      "id": "photo-front",
      "kind": "reference_image",
      "title": "Front and three-quarter photographs of the A77 (Wikimedia Commons, CC BY / CC BY-SA)",
      "rights": "reference_only"
    }
  ],
  "facts": [
    {
      "key": "subject",
      "value": "ReVox A77 reel-to-reel tape recorder",
      "certainty": "user_supplied",
      "source": "request"
    },
    {
      "key": "motion.request",
      "value": "Both reels turning, tape running past the heads",
      "certainty": "user_supplied",
      "source": "request"
    },
    {
      "key": "body.size",
      "value": "0.413 x 0.359 x 0.216 m (16 1/4 x 14 1/8 x 8 1/2 in), wooden cabinet model",
      "certainty": "verified",
      "source": "spec",
      "note": "Maker/collector specification of the A77 cabinet, measured without reels."
    },
    {
      "key": "reel.diameter",
      "value": 0.267,
      "certainty": "verified",
      "unit": "m",
      "source": "spec",
      "note": "10.5 in (26.7 cm) maximum reel; flange radius 0.1335 m."
    },
    {
      "key": "reel.type",
      "value": "10.5-inch NAB metal reel, three large windows, three-tab hub",
      "certainty": "verified",
      "source": "photo-front",
      "note": "Reels in the reference photographs; the deck accepts standard NAB reels."
    },
    {
      "key": "reel.spacing",
      "value": 0.274,
      "certainty": "inferred",
      "unit": "m",
      "note": "Axle spacing traced from the front photograph: the flanges almost touch between the spools."
    },
    {
      "key": "head.count",
      "value": 3,
      "certainty": "verified",
      "source": "spec",
      "note": "Separate erase, record and playback heads ('True Radius' design)."
    },
    {
      "key": "head.kind",
      "value": "erase, record and playback heads in a row ahead of the capstan",
      "certainty": "verified",
      "source": "manual",
      "note": "Service manual front-panel and tape-path drawings; head order visible in museum photographs."
    },
    {
      "key": "tape.width",
      "value": 0.00635,
      "certainty": "verified",
      "unit": "m",
      "source": "spec",
      "note": "Quarter-inch tape."
    },
    {
      "key": "tape.speed",
      "value": 0.1905,
      "certainty": "verified",
      "unit": "m/s",
      "source": "spec",
      "note": "7.5 ips at the standard speed setting."
    },
    {
      "key": "transport",
      "value": "solenoid push buttons: rewind, fast forward, play, stop, record",
      "certainty": "verified",
      "source": "manual"
    },
    {
      "key": "panel.layout",
      "value": "five transport buttons, four rotary controls, three jack sockets, two VU meters and a power switch",
      "certainty": "verified",
      "source": "photo-front",
      "note": "Layout read from the front photograph and the manual's key to figs 2.1-1/2.1-2."
    },
    {
      "key": "brand",
      "value": "REVOX",
      "certainty": "verified",
      "source": "manual",
      "note": "Name on the stainless band above the control panel."
    },
    {
      "key": "model.text",
      "value": "A 77  \u00b7  STEREO  \u00b7  TAPERECORDER",
      "certainty": "verified",
      "source": "photo-front",
      "note": "Lettering under the REVOX name on the MK III/IV trim band."
    },
    {
      "key": "legend.volume",
      "value": "VOLUME",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "legend.balance",
      "value": "BALANCE",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "legend.phones",
      "value": "PHONES",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "legend.mic1",
      "value": "MIC CH 1",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "legend.mic2",
      "value": "MIC CH 2",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "legend.level",
      "value": "LEVEL",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "legend.power",
      "value": "POWER",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "legend.rec1",
      "value": "REC CH 1",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "legend.rec2",
      "value": "REC CH 2",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "legend.monitor",
      "value": "MONITOR",
      "certainty": "verified",
      "source": "photo-front"
    },
    {
      "key": "reel.rpm",
      "value": "supply 17.5 rpm, take-up 25.3 rpm",
      "certainty": "inferred",
      "note": "Computed as 60v/(2*pi*r) for 7.5 ips and the modelled pack radii; the packs stay fixed, so this is an illustrative short loop."
    },
    {
      "key": "tape.path",
      "value": "pack tangent - guide - across three heads - capstan/pinch - guide - pack tangent",
      "certainty": "inferred",
      "note": "Routed from the reference photographs and the service-manual tape path; the ribbon is a fixed geometric locus, the transport rotates."
    },
    {
      "key": "heads.exposed",
      "value": "head cover removed for threading, as in the manual's tape-path photographs",
      "certainty": "inferred",
      "note": "The A77's head cover is not modelled, so the tape at the heads is visible."
    },
    {
      "key": "needles",
      "value": "VU needles swing illustratively, not from audio",
      "certainty": "decorative"
    }
  ],
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      "mirror": "x"
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      "look": {
        "fill": "none",
        "line": "none"
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    },
    {
      "id": "legend-rec2",
      "role": "detail",
      "certainty": "inferred",
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      "shape": {
        "type": "plane",
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      },
      "at": [
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      "look": {
        "fill": "none",
        "line": "none"
      }
    },
    {
      "id": "legend-monitor",
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      "certainty": "inferred",
      "stage": 5,
      "shape": {
        "type": "plane",
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      },
      "at": [
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      ],
      "look": {
        "fill": "none",
        "line": "none"
      }
    }
  ],
  "labels": [
    {
      "id": "legend-volume-text",
      "part": "legend-volume",
      "field": "legend.volume",
      "role": "meta",
      "align": "center",
      "region": [
        0,
        0,
        1,
        1
      ]
    },
    {
      "id": "legend-balance-text",
      "part": "legend-balance",
      "field": "legend.balance",
      "role": "meta",
      "align": "center",
      "region": [
        0,
        0,
        1,
        1
      ]
    },
    {
      "id": "legend-phones-text",
      "part": "legend-phones",
      "field": "legend.phones",
      "role": "meta",
      "align": "center",
      "region": [
        0,
        0,
        1,
        1
      ]
    },
    {
      "id": "legend-mic1-text",
      "part": "legend-mic1",
      "field": "legend.mic1",
      "role": "meta",
      "align": "center",
      "region": [
        0,
        0,
        1,
        1
      ]
    },
    {
      "id": "legend-mic2-text",
      "part": "legend-mic2",
      "field": "legend.mic2",
      "role": "meta",
      "align": "center",
      "region": [
        0,
        0,
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        1
      ]
    },
    {
      "id": "legend-level1-text",
      "part": "legend-level1",
      "field": "legend.level",
      "role": "meta",
      "align": "center",
      "region": [
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      ]
    },
    {
      "id": "legend-level2-text",
      "part": "legend-level2",
      "field": "legend.level",
      "role": "meta",
      "align": "center",
      "region": [
        0,
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      ]
    },
    {
      "id": "legend-power-text",
      "part": "legend-power",
      "field": "legend.power",
      "role": "meta",
      "align": "center",
      "region": [
        0,
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      ]
    },
    {
      "id": "legend-rec1-text",
      "part": "legend-rec1",
      "field": "legend.rec1",
      "role": "meta",
      "align": "center",
      "region": [
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    },
    {
      "id": "legend-rec2-text",
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      "field": "legend.rec2",
      "role": "meta",
      "align": "center",
      "region": [
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    },
    {
      "id": "legend-monitor-text",
      "part": "legend-monitor",
      "field": "legend.monitor",
      "role": "meta",
      "align": "center",
      "region": [
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    },
    {
      "id": "brand-text",
      "part": "name-band",
      "field": "brand",
      "role": "title",
      "face": "front",
      "align": "center",
      "region": [
        0.6,
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    },
    {
      "id": "model-text",
      "part": "name-band",
      "field": "model.text",
      "role": "meta",
      "face": "front",
      "align": "center",
      "region": [
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    }
  ],
  "anchors": {
    "front": {
      "part": "control-panel",
      "face": "front"
    },
    "base": {
      "point": [
        0,
        0,
        0
      ],
      "up": [
        0,
        1,
        0
      ]
    }
  },
  "annotations": [
    {
      "id": "meter-note",
      "text": "VU needles illustrative",
      "part": "meter-housing-1",
      "offset": [
        0.02,
        0.032,
        0.02
      ]
    }
  ],
  "presentation": {
    "framing": {
      "yaw": 20,
      "pitch": 10,
      "fit": 1.0
    },
    "views": [
      {
        "id": "hero",
        "label": "Front three-quarter",
        "yaw": 22,
        "pitch": 11
      },
      {
        "id": "front",
        "label": "Front elevation",
        "yaw": 0,
        "pitch": 3
      },
      {
        "id": "reels",
        "label": "Reels and tape packs",
        "yaw": 10,
        "pitch": 6,
        "target": "sup-flange-front-rim",
        "distance": 1.55
      },
      {
        "id": "transport",
        "label": "Tape past the three heads",
        "yaw": 6,
        "pitch": 15,
        "target": "head-mount",
        "distance": 1.35
      },
      {
        "id": "controls",
        "label": "Control panel",
        "yaw": 4,
        "pitch": 6,
        "target": "control-panel",
        "distance": 1.25
      }
    ],
    "atmosphere": {
      "haze": 0.55,
      "scanlines": true,
      "vignette": true,
      "grid": true,
      "projector": false,
      "motes": 0.3
    },
    "occlusion": "xray",
    "certainty_style": "subtle",
    "background": "deep",
    "float": 0
  },
  "animation": {
    "assembly": {
      "style": "build",
      "seconds": 5.5,
      "interference": true
    },
    "idle": {
      "life": "alive",
      "events": [
        "scan",
        "sweep",
        "shimmer"
      ],
      "cadence": [
        6,
        11
      ],
      "strength": 0.55
    },
    "camera": {
      "drift": 5,
      "breathe": 0.03,
      "tour": [
        {
          "view": "transport",
          "at": 13,
          "fly": 3
        },
        {
          "view": "reels",
          "at": 20,
          "fly": 3
        },
        {
          "view": "hero",
          "at": 27,
          "fly": 3.5
        }
      ]
    },
    "reduced_motion": "still"
  },
  "authoring": {
    "tier": "showcase",
    "research": "done",
    "sources": [
      "request",
      "manual",
      "spec",
      "photo-front"
    ],
    "identity": [
      {
        "feature": "two 10.5-inch open reels, wider than the cabinet, almost touching between the spools",
        "parts": [
          "sup-flange-front-rim",
          "tak-flange-front-rim",
          "sup-flange-front-sectors",
          "tak-flange-front-sectors",
          "sup-hub",
          "tak-hub"
        ]
      },
      {
        "feature": "stainless name band carrying REVOX / A 77 STEREO TAPERECORDER above the control panel",
        "parts": [
          "name-band",
          "name-band-lip"
        ]
      },
      {
        "feature": "console under the name band: five lever buttons, four knurled knobs, two VU meters, power switch",
        "parts": [
          "button-paddle-0",
          "vol-body",
          "bal-body",
          "meter-face-0",
          "meter-face-1",
          "power-switch",
          "pilot-lamp"
        ]
      },
      {
        "feature": "quarter-inch tape threaded from the supply pack across three heads past the capstan to the take-up pack",
        "parts": [
          "tape-1",
          "tape-2",
          "tape-3",
          "tape-4",
          "head-0",
          "head-1",
          "head-2",
          "capstan",
          "pinch-roller",
          "sup-pack",
          "tak-pack"
        ]
      }
    ],
    "review_rounds": 3,
    "outcome": "self-reviewed",
    "next": [
      "Rebuild the three head faces as rectilinear pole pieces with a curved front and a visible gap slit; the cylindrical drums read as rings at close range.",
      "Add the sprung tape-tension arms with rollers that flank the head block on the real deck, and thread the ribbon over them.",
      "Reel windows are wedge gaps between three spokes; the ReVox reel's windows are rounded trapezoids, traceable from the front photograph.",
      "The tape ribbon is a fixed geometric path: the reels, guides and capstan turn but the ribbon itself does not travel. A splice marker would make the transport read as running.",
      "Rear connector panel exists but is simplified; the back view still reads as a plain crate."
    ]
  }
}