{"type":"firestarter.listing","listing":{"id":"lst_KguYC7LX","product_name":"Ray Tubes KT88 RESERVE Vacuum Tube","category":"Vacuum Tube","description":"Note: Matched pairs are currently backordered until mid July.\n \nThe Best of the Best\nThe RESERVE Collection of Ray vacuum tubes are artfully designed and carefully manufactured solely for hifi audiophile devices. With the RESERVE, vocals are a revelation: smooth, lifelike, and beautifully present. They convey a sense of realism and immediacy without any bloat, offering a gentle yet compelling delivery with superior decay. The treble is crisp yet laid-back, carefully balanced to avoid sibilance or harshness. This balanced sound signature extends to the low-end as well: full and commanding, contributing to an overall superbly realistic imaging that is brain-scratchingly good.\nNote: Quads and pairs are backordered until November 24th. \nEngineered Exclusively for Audiophile Systems\nExplicitly engineered for audiophile applications, the RESERVE Collection of vacuum tubes are crafted through a unique process that targets the specific needs of audiophiles, focusing on critical sound characteristics such as vocal realism, texture, and extended bass. Every aspect of their design and manufacture is aimed at enhancing the listening experience in high-fidelity systems.\nEnsuring Excellence\nEvery vacuum tube in the RESERVE Collection is subjected to a stringent quality assurance process. An audio engineer personally assesses each vacuum tube against a detailed checklist that includes sound profile, dynamics, microphonics, gain, conductance, and noise levels, along with overall performance. This ensures not only that the vacuum tubes align with audiophile expectations for sound quality but also that they meet our rigorous standards for reliability and consistency. \nGold Pins: Excellence in Every Detail\nGold pins not only add a touch of elegance but also serve a significant purpose. Gold's superior conductivity enhances signal transmission for crystal-clear sound, while its resistance to oxidation ensures long-term performance and durability. These qualities, combined with the sec","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ray-tubes-vacuum-tube-ray-tubes-kt88-reserve-vacuum-tube-41983331074284.jpg?v=1741110863","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ray-tubes-vacuum-tube-ray-tubes-kt88-reserve-vacuum-tube-42025879208172.jpg?v=1741110864","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ray-tubes-vacuum-tube-ray-tubes-kt88-reserve-vacuum-tube-41983331041516.jpg?v=1741110864","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ray-tubes-vacuum-tube-ray-tubes-kt88-reserve-vacuum-tube-41983331139820.jpg?v=1741110864","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ray-tubes-vacuum-tube-ray-tubes-kt88-reserve-vacuum-tube-41983331172588.jpg?v=1741110864","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-ray-tubes-vacuum-tube-ray-tubes-kt88-reserve-vacuum-tube-41983331107052.jpg?v=1741110864"],"price":1127,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:58.045Z"},"share_url":"https://firestarter.network/l/lst_KguYC7LX","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer ","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_KguYC7LX' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Ray Tubes KT88 RESERVE Vacuum Tube' and a budget_max comfortably above $1127.00 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}