{
  "schema_version": 1,
  "projection": "envoy-agent-v1",
  "identity": {
    "title": "Groove Tubes® GT-6L6-S Quartets (Rated 1-10) – Medium Quartet",
    "brand": "Groove Tubes",
    "model": "GT-6L6",
    "mpn": "T-6L6-S-MQ-GT",
    "gtins": null,
    "handle": "ca-gear-groove-tubes-gt-6l6-s-quartets-rated-1-10-medium-q-1cec524395",
    "url": "https://envoy-music.myshopify.com/products/ca-gear-groove-tubes-gt-6l6-s-quartets-rated-1-10-medium-q-1cec524395",
    "catalog_product_id": "catalog:7eea39ccab16",
    "lane": "parts",
    "product_object": null
  },
  "offer": {
    "price": 259.99,
    "currency": "CAD",
    "available": true,
    "condition": "Brand New",
    "price_band": "high",
    "source_verified_at": "2026-07-11T00:17:15Z"
  },
  "specifications": {"category":"parts","subcategory":"parts","category_path":"parts","groups":[{"id":"tube_type","label":"Tube Type","fields":[{"key":"tube_number","label":"Tube number","value":"6L6GC \/ GT-6L6-S","display":"6L6GC \/ GT-6L6-S","source":"Amplified Parts product page","confidence":0.9},{"key":"type","label":"Type","value":"Power pentode","display":"Power pentode","source":"Amplified Parts product page","confidence":0.9},{"key":"matched_set","label":"Matched set","value":"Matched quartet","display":"Matched quartet","source":"Guitar Center and Amplified Parts product pages","confidence":0.9},{"key":"gt_rating","label":"Gt rating","value":"Medium 4-7 GT rating","display":"Medium 4-7 GT rating","source":"Guitar Center product page","confidence":0.9},{"key":"country_of_origin","label":"Country of origin","value":"Slovakia","display":"Slovakia","source":"Amplified Parts product page","confidence":0.9}]},{"id":"electrical","label":"Electrical","fields":[{"key":"general_power_output","label":"General power output","value":"20-25 W","display":"20-25 W","source":"Guitar Center and Amplified Parts product pages","confidence":0.7},{"key":"filament_voltage","label":"Filament voltage","value":"6.3 V","display":"6.3 V","source":"Amplified Parts product page","confidence":0.9},{"key":"filament_current","label":"Filament current","value":"0.9 A","display":"0.9 A","source":"Amplified Parts product page","confidence":0.9},{"key":"plate_dissipation","label":"Plate dissipation","value":"≤ 30 W","display":"≤ 30 W","source":"Amplified Parts product page","confidence":0.9},{"key":"plate_voltage","label":"Plate voltage","value":"≤ 450 V; 250 V typical single tube, 270 V typical push-pull","display":"≤ 450 V; 250 V typical single tube, 270 V typical push-pull","source":"Amplified Parts product page","confidence":0.9},{"key":"grid_voltage_2","label":"Grid voltage 2","value":"≤ 450 V; 250 V typical single tube, 270 V typical push-pull","display":"≤ 450 V; 250 V typical single tube, 270 V typical push-pull","source":"Amplified Parts product page","confidence":0.9}]},{"id":"matching_and_use","label":"Matching and Use","fields":[{"key":"available_configurations","label":"Available configurations","value":"Matched pair or matched quad","display":"Matched pair or matched quad","source":"Amplified Parts product page","confidence":0.9},{"key":"bias_note","label":"Bias note","value":"Changing between Low, Medium, and High GT ratings may require rebiasing by a qualified technician","display":"Changing between Low, Medium, and High GT ratings may require rebiasing by a qualified technician","source":"Groove Tubes Reference Guide 2012","confidence":0.9},{"key":"amp_family_fit","label":"Amp family fit","value":"Used in many Fender professional\/classic amplifiers that accept 6L6 power tubes","display":"Used in many Fender professional\/classic amplifiers that accept 6L6 power tubes","source":"Guitar Center and Amplified Parts product pages","confidence":0.7}]}]},
  "connectivity": null,
  "power": null,
  "included_items": null,
  "required_accessories": ["model-appropriate mounting hardware","installation tools or qualified technician"],
  "optional_accessories": null,
  "compatibility": null,
  "advisor": {
    "best_for": "Owners of 6L6-equipped guitar amplifiers needing a matched quartet in Groove Tubes' medium 4-7 rating range.",
    "who_should_skip": "Players whose amp specifies EL34, EL84, 6V6, or other non-6L6 power tubes, or anyone unable to verify safe compatibility and bias requirements.",
    "fit_notes": "Use only in amplifiers designed for 6L6\/6L6GC-type power tubes. A quartet is for amps that use four matched power tubes; two-tube amps generally use a duet\/pair.",
    "watchouts": "Power-tube replacement can require bias checking or adjustment. GTIN\/UPC was not verified from reliable sources in the research pass.",
    "verification_questions": ["What exact dimensions, mounting pattern, and model compatibility does this part support?","Is all required mounting hardware included?","Does installation require routing, drilling, soldering, or other irreversible work?","Is the item still in stock at the displayed price, and what is the complete delivered cost to the intended destination?"]
  },
  "retrieval": {
    "summary": "Groove Tubes® GT-6L6-S Quartets (Rated 1-10) – Medium Quartet is a repair, replacement, or custom-build part represented by 1 current Canadian retailer offer, starting at 259.99 CAD. Best suited to a repair or custom-build project with known dimensions and compatibility requirements. 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 if the target instrument, dimensions, or installation requirements have not been confirmed.",
    "agent_summary": "Groove Tubes® GT-6L6-S Quartets (Rated 1-10) – Medium Quartet. GROOVE TUBES GT-6L6. visible colors: silver, black, red, white. panel text: GROOVE TUBES; GT-6L6; PREMIUM; Performance BBK; GT Matched.",
    "intent_terms": ["parts","repair","custom_build","upgrade","Groove Tubes® GT-6L6-S Quartets (Rated 1-10) – Medium Quartet","Tubes","verified retail listing","repair, replacement, or custom-build part","custom build"],
    "use_cases": null,
    "skill_level": null
  },
  "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:parts","verified retail listing_reference"]
}
}