{"type":"firestarter.listing","listing":{"id":"lst_uPlvDb_x","product_name":"NEC 6X4 (6202) Vacuum Tube","category":"Vacuum Tube","description":"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\nThe NEC 6X4 is a compact full-wave rectifier that boasts reliability, low noise, and steady voltage delivery in small-signal and low-power audio circuits. Manufactured in Japan to tight industrial standards, NEC versions are well regarded for their calm, controlled presentation by keeping the power supply quiet and well regulated, which helps downstream stages perform at their best. \n\n\n\n\n\n\n\nArchive Assessed, Apos Assured\nAll Archive tubes are thoroughly tested, inspected, photographed, and inventoried, guaranteeing the quality of each tube that's shipped to customers. All tubes carry an Apos 12-month warranty against manufacturing defects. \nAre the tubes...dusty...?\nBecause these are genuine New Old Stock tubes, small cosmetic irregularities may be present. These aren't defects but artifacts of vintage manufacturing and decades of storage. They have no impact on reliability or sonic performance.\nSpecs\n\n\nBrand / Type: NEC 6X4 / EZ90 / U78 / CV493 / CV4005 / 6202\n\nPlate Type: Gray Plate\n\nGetter Type: Top Ring Getter\n\nBox: Original Box\n\nMade in: Japan\n\nTested on: Amplitrex AT1000 Advanced Digital Tube Tested\n","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-archive-tubes-vacuum-tube-nec-6x4-6202-vacuum-tube-1218427143.jpg?v=1771373348","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-archive-tubes-vacuum-tube-nec-6x4-6202-vacuum-tube-1218427146.jpg?v=1771373288","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-archive-tubes-vacuum-tube-nec-6x4-6202-vacuum-tube-1218427144.jpg?v=1771373228","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-archive-tubes-vacuum-tube-nec-6x4-6202-vacuum-tube-1218427148.jpg?v=1771373168","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-archive-tubes-vacuum-tube-nec-6x4-6202-vacuum-tube-1218427147.jpg?v=1771373108","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-archive-tubes-vacuum-tube-nec-6x4-6202-vacuum-tube-1218427150.jpg?v=1771373049","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-archive-tubes-vacuum-tube-nec-6x4-6202-vacuum-tube-1218427149.jpg?v=1771372988","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-archive-tubes-vacuum-tube-nec-6x4-6202-vacuum-tube-1218427145.jpg?v=1771372928","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-archive-tubes-vacuum-tube-nec-6x4-6202-vacuum-tube-1220503274.png?v=1771366928"],"price":100,"currency":"USD","in_stock":true,"inventory_qty":29997,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:55.992Z"},"share_url":"https://firestarter.network/l/lst_uPlvDb_x","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 <your Firestarter API key>","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_uPlvDb_x' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy NEC 6X4 (6202) Vacuum Tube' and a budget_max comfortably above $100.00 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."]}}