{
  "schema_version": 1,
  "projection": "envoy-agent-v1",
  "identity": {
    "title": "Model 670",
    "brand": "FAIRCHILD",
    "model": "MODEL 670",
    "mpn": null,
    "gtins": null,
    "handle": "ca-fairchild-model-670-31b4d8daa3",
    "url": "https://envoy-music.myshopify.com/products/ca-fairchild-model-670-31b4d8daa3",
    "catalog_product_id": "catalog:eea4d41ada3c",
    "lane": "studio",
    "product_object": "tube compressor"
  },
  "offer": {
    "price": 48500.0,
    "currency": "CAD",
    "available": true,
    "condition": "Brand New",
    "price_band": "boutique",
    "source_verified_at": "2026-07-10T23:56:52Z"
  },
  "specifications": {"category":"Studio compressor\/limiter","groups":[{"id":"general","label":"General","fields":[{"key":"product_type","label":"Type","value":"Dual mono\/stereo tube compressor\/limiter","display":"Dual mono\/stereo tube compressor","source":"https:\/\/www.economik.com\/products\/model-670","confidence":0.95},{"key":"channels","label":"Channels","value":"2","display":"2 (dual mono or stereo)","source":"https:\/\/www.economik.com\/products\/model-670","confidence":0.9},{"key":"construction","label":"Construction","value":"Hand-wired point-to-point, custom-designed transformers","source":"https:\/\/www.economik.com\/products\/model-670","confidence":0.9},{"key":"edition","label":"Edition","value":"Faithful recreation (reissue) of the original Fairchild 670","source":"https:\/\/www.economik.com\/products\/model-670","confidence":0.9},{"key":"rack_height","label":"Rack height (original design)","value":"6","unit":"U","display":"6U","source":"https:\/\/www.gearnews.com\/fairchild-670-studio\/","confidence":0.8},{"key":"metering","label":"Metering","value":"VU metering","source":"https:\/\/www.economik.com\/products\/model-670","confidence":0.9}]},{"id":"tubes_transformers","label":"Tubes \u0026 Transformers","fields":[{"key":"tube_complement","label":"Tube complement","value":"8x 6386, 2x 12AX7, 4x 6973, 2x 12BH7, 1x E80F (or EF806), 1x 5651, 1x EL34, 1x GZ34","source":"https:\/\/www.telefunken-elektroakustik.com\/product\/fairchild-670\/","confidence":0.95},{"key":"tube_count","label":"Tube count","value":"20","unit":"tubes","display":"20 tubes","source":"https:\/\/www.gearnews.com\/fairchild-670-660-compressor-studio\/","confidence":0.9},{"key":"transformers_original","label":"Transformers (original design)","value":"11 transformers and 2 inductors","source":"https:\/\/www.gearnews.com\/fairchild-670-studio\/","confidence":0.8},{"key":"transformers_reissue","label":"Transformers (reissue)","value":"Custom-wound to original specifications; made larger to reduce tube wear","source":"https:\/\/www.audiosteps.io\/shop\/en\/product\/fairchild-670-tube-limiter-compressor\/","confidence":0.8}]},{"id":"dynamics","label":"Dynamics","fields":[{"key":"time_constants","label":"Time constants","value":"6 selectable positions","display":"6 selectable (positions 5-6 program-dependent auto release)","source":"https:\/\/www.economik.com\/products\/model-670","confidence":0.95},{"key":"attack_time","label":"Attack time","value":"0.2-0.4","unit":"ms","display":"0.2-0.4 ms depending on position","source":"https:\/\/www.zenproaudio.com\/fairchild-670","confidence":0.9},{"key":"release_time","label":"Release time","value":"0.2-25","unit":"s","display":"0.2 s to 25 s (6 positions, including 2 auto modes)","source":"https:\/\/www.zenproaudio.com\/fairchild-670","confidence":0.85},{"key":"compression_ratio","label":"Compression ratio","value":"1:2 to 1:30","display":"Variable, 1:2 to 1:30 (a function of the amount of limiting)","source":"https:\/\/www.economik.com\/products\/model-670","confidence":0.95}]},{"id":"audio_performance","label":"Audio Performance","fields":[{"key":"frequency_response","label":"Frequency response","value":"40 Hz - 15 kHz +\/- 1 dB","source":"https:\/\/www.telefunken-elektroakustik.com\/product\/fairchild-670\/","confidence":0.95},{"key":"gain","label":"Gain","value":"+7","unit":"dB","display":"+7 dB","source":"https:\/\/www.telefunken-elektroakustik.com\/product\/fairchild-670\/","confidence":0.9},{"key":"noise","label":"Noise level","value":"70 dB below +4 dBm","source":"https:\/\/www.telefunken-elektroakustik.com\/product\/fairchild-670\/","confidence":0.9},{"key":"input_impedance","label":"Input impedance","value":"600","unit":"ohms","display":"600 ohms balanced","source":"https:\/\/www.zenproaudio.com\/fairchild-670","confidence":0.95},{"key":"output_impedance","label":"Output impedance","value":"600","unit":"ohms","display":"600 ohms balanced","source":"https:\/\/www.zenproaudio.com\/fairchild-670","confidence":0.95},{"key":"input_level","label":"Input level range","value":"0 dBm to +16 dBm","source":"https:\/\/www.telefunken-elektroakustik.com\/product\/fairchild-670\/","confidence":0.9},{"key":"output_level","label":"Output level","value":"+4 or +8 dBVU (+27 dBm clipping point)","source":"https:\/\/www.telefunken-elektroakustik.com\/product\/fairchild-670\/","confidence":0.9}]},{"id":"power","label":"Power","fields":[{"key":"power_requirements","label":"Power requirements","value":"120 or 240 V, 60 Hz AC, 3 A","display":"120 or 240 volts, 60 cycles AC, 3 amps","source":"https:\/\/www.economik.com\/products\/model-670","confidence":0.95}]}]},
  "connectivity": null,
  "power": null,
  "included_items": null,
  "required_accessories": ["appropriate audio and data cables","compatible monitoring, mounting, or power setup"],
  "optional_accessories": null,
  "compatibility": null,
  "advisor": {
    "best_for": "Professional studios and mastering\/mix engineers who want the classic Fairchild variable-mu sound on a stereo bus, in dual mono, or on individual sources. Its six time constants — including two program-dependent auto-release positions — and ratios that move from 1:2 to 1:30 let it range from subtle, transparent leveling to heavy, pumping compression, which is exactly how the listing characterizes it.",
    "who_should_skip": "Anyone with limited rack space or budget: the original design occupies 6U, contains 20 tubes and a large complement of transformers, and draws 3 amps at 120\/240 V. Engineers who need a wideband mastering spec should note the published frequency response tops out at 15 kHz (+\/-1 dB, per the manufacturer's partner page). Project studios that just want an occasional bus compressor will find modern variable-mu alternatives far more practical.",
    "fit_notes": "This is the current Fairchild Recording Equipment reissue — economik describes it as 'a faithful and meticulous recreation of the original FAIRCHILD 670,' hand-wired point-to-point with custom transformers and the original 20-tube complement (including 8x 6386). The brand was revived by Telefunken Elektroakustik CEO Toni Fishman, with the project begun in Estonia in 2020. I\/O is balanced 600-ohm; output operating level is +4 or +8 dBVU with a +27 dBm clipping point. The reissue's transformers are stated to be made larger than the originals to reduce tube wear. The original 670 also provided lateral\/vertical (mid-side-style) control for stereo disk mastering.",
    "watchouts": "Sources conflict on transformer count: Gearnews describes the original as 11 transformers plus 2 inductors, while some retail copy for the reissue cites a higher figure; the manufacturer's partner page only says 'custom-wound transformers.' Per-position attack\/release figures also vary slightly in transcription across sources (e.g., position 1 release is 0.3 s on the economik listing), so the 0.2-0.4 ms attack \/ 0.2-25 s release ranges are the safest summary. Weight and exact dimensions could not be verified to a citable source and are omitted. The economik listing showed the unit as unavailable for immediate purchase at the time of research — confirm lead time, and confirm the unit is the new reissue rather than a vintage original, since vintage 670s trade at very different prices and condition risk.",
    "verification_questions": ["Which connections, drivers, operating systems, and sample rates are supported by this exact revision?","What cables, mounts, power supplies, or licenses are included?","Is the current retailer listing new stock, demo stock, open box, or special order?","Is the item still in stock at the displayed price, and what is the complete delivered cost to the intended destination?"]
  },
  "retrieval": {
    "summary": "Model 670 is a recording and studio product represented by 1 current Canadian retailer offer, starting at 48500.00 CAD. Best suited to buyers who can place it within a known recording, monitoring, or signal-routing workflow. EnvoyMusic has verified the source price and availability signal, but has not independently verified every technical specification or US fulfillment detail. This is an verified retail listing reference, not inventory stocked or fulfilled by EnvoyMusic. Retailer price and availability can change; recheck the source before making a purchase decision. Skip it until computer, operating-system, I\/O, cabling, mounting, and room requirements are confirmed.",
    "agent_summary": "FAIRCHILD Model 670. FAIRCHILD MODEL 670. visible colors: black, gray, beige, red. visible controls: toggle switch, rotary knobs, push buttons. panel text: ON; FAIRCHILD; LEFT LAT METERING; LEFT CHANNEL INPUT GAIN; LEFT LAT THRESHOLD; LEFT LAT TIME CONSTANT; 5A; RIGHT VERT METERING; RIGHT CHANNEL INPUT GAIN; RIGHT VERT THRESHOLD; RIGHT VERT TIME CONSTANT; AGC LEFT RIGHT LAT VERT.",
    "intent_terms": ["studio","home_recording","content_creation","signal_chain","Model 670","FAIRCHILD","Tube Compressors","verified retail listing","recording and studio product","home recording","content creation","signal chain"],
    "use_cases": ["studio-recording"],
    "skill_level": "pro"
  },
  "trust": {
    "has_verified_retail_listing": true,
    "source_count": 1,
    "source_tier_mix": ["retailer"],
    "evidence_flags": {"external_inventory":true,"source_availability":true,"source_price":true,"source_url":true,"structured_specs":false},
    "spec_provenance": null
  },
  "related": {
    "similar_item_ids": [],
    "comparison_reasons": ["source_count:1","lane:studio","verified retail listing_reference"]
}
}