{
  "schema_version": 1,
  "projection": "envoy-agent-v1",
  "identity": {
    "title": "Valve Art KT 88 power tubes Early 2000s",
    "brand": "Valve Art",
    "model": null,
    "mpn": null,
    "gtins": null,
    "handle": "gm-valve-art-kt-88-power-tubes-matched-quartet-valve-art-kt-88-power-tube-c8c5f989",
    "url": "https://envoy-music.myshopify.com/products/gm-valve-art-kt-88-power-tubes-matched-quartet-valve-art-kt-88-power-tube-c8c5f989",
    "catalog_product_id": "product_dc90f69cc8c5f989",
    "lane": "studio",
    "product_object": "power tube"
  },
  "offer": {
    "price": 150.7,
    "currency": "CAD",
    "available": true,
    "condition": "Excellent",
    "price_band": "entry",
    "source_verified_at": null
  },
  "specifications": {"type":"json","groups":[{"name":"Product facts","fields":[{"label":"Manufactured by","value":"Valve Art\/ O\u0026J Ent. China","source":"https:\/\/www.tubeman.com\/index.php?l=product_detail\u0026p=1107"}]},{"name":"Format and size","fields":[{"label":"Dimensions note","value":"88 in Wikipedia , KT88 in Duncan Amps , and K","source":"https:\/\/www.thetubestore.com\/power-tubes\/kt88-tube-types"},{"label":"Format","value":"Eurorack","source":"https:\/\/envoy-music.myshopify.com\/products\/gm-valve-art-kt-88-power-tubes-matched-quartet-valve-art-kt-88-power-tube-c8c5f989"}]},{"name":"Power","fields":[{"label":"Power","value":"6V6 Tubes 6550 Tubes 300B Tu","source":"https:\/\/www.thetubestore.com\/power-tubes\/kt88-tube-types"}]}]},
  "connectivity": null,
  "power": null,
  "included_items": null,
  "required_accessories": ["appropriate cables","monitoring solution","mount or stand if relevant"],
  "optional_accessories": null,
  "compatibility": null,
  "advisor": {
    "best_for": "Players matching the published factory\/retail specs listed above.",
    "who_should_skip": null,
    "fit_notes": "Verify power, format, and connectivity against your rig before purchase; only sourced fields are listed.",
    "watchouts": "Unsourced claims are omitted. Listing-specific mods, kits, or incomplete units may not match the base model specs.",
    "verification_questions": ["Can you confirm exactly what is included in the sale and show it in current photos?","Are there any functional issues, repairs, or missing parts not shown in the listing?","Can you provide close-up photos of wear points, serial numbers, and any modifications?","Can you confirm the core specs that matter for compatibility in this setup?","Is this still available and has anything changed since the listing was posted?"]
  },
  "retrieval": {
    "summary": "Valve Art KT 88 power tubes Early 2000s -. Valve Art. KT 88 power tubes matched quartet. Pro Audio. Pro Audio. available from reverb. price range 110 USD. condition Excellent. New old stock. They didn’t fit in the chassis. Never used. Valve Art KT 88 power tubes Early 2000s -. Valve Art. KT 88 power tubes matched quartet. Glass. Excellent. Pro Audio. Pro Audio. New old stock. They didn’t fit in the chassis. Never used. Valve Job. Springfield, OH, United States. tags source:reverb family:pro_audio listing_status:live brand:valve_art model:kt_88_power_tubes_matched_quartet category:pro_audio price_band:entry segment:beginner condition:excellent has:photos",
    "agent_summary": "Valve Art KT 88 power tubes matched quartet is a beginner-friendly pro audio listing with marketplace-sourced data. Valve Art KT 88 power tubes Early 2000s - currently sits around 110 USD. New old stock. Marketplace data is richer on listing context, but it needs more buyer verification. Entry-level price positioning makes it accessible for new players. Marketplace listing quality varies by seller, so condition and included items still need verification.",
    "intent_terms": ["Valve Art KT 88 power tubes Early 2000s -","Valve Art","KT 88 power tubes matched quartet","Pro Audio","brand:valve_art","category:pro_audio","condition:excellent","family:pro_audio","has:photos","listing_status:live","model:kt_88_power_tubes_matched_quartet","price_band:entry","segment:beginner","source:reverb","brand valve art","category pro audio","condition excellent","family pro audio","has photos","listing status live","model kt 88 power tubes matched quartet","price band entry","segment beginner","source reverb","practice","starter-rig","live-performance","tone-shaping","signal-chain","Valve Job","Best suited to beginners or budget-constrained shoppers building a first usable rig.","Players building a first pro audio setup with limited budget and a need for obvious","low-friction value."],
    "use_cases": ["studio-recording","live-performance","repair-build"],
    "skill_level": null
  },
  "trust": {
    "has_verified_retail_listing": true,
    "source_count": 1,
    "source_tier_mix": ["marketplace"],
    "evidence_flags": {"has_description":true,"has_images":true,"has_reviews":false,"has_specs":false,"source_count":1},
    "spec_provenance": {"specifications":{"source_url":"https:\/\/www.tubeman.com\/index.php?l=product_detail\u0026p=1107","method":"gear_universe_read_model","fetched":"2026-07-30"}}
  },
  "related": {
    "similar_item_ids": [],
    "comparison_reasons": ["source_count:1","family:Pro Audio","marketplace_only","identity_confidence:0.9"]
}
}