{"type":"firestarter.listing","listing":{"id":"lst_cewxqgDC","product_name":"Brimar CV133/ 6C4/ EC90 1960s Military Grade Vacuum Tube","category":"Vacuum Tube","description":"Brimar CV133 tubes were manufactured in England during the early 1960s as a British military version of the 6C4 / EC90 miniature single triode. Brimar tubes from this period emphasize ruggedized valves for communications, instrumentation, and defense applications. They feature black plates, ring getters, and military-grade construction. Each tube has been screened and strictly matched on an Amplitrex AT1000 digital laboratory system.\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: Brimar CV133 / 6C4 / EC90\n\nPlate Type: Black\n\nGetter Type: Ring Getter\n\nMilitary Grade: Yes\n\nMade in: England\n\nBox Type: NOS in Original Box\n\nTested on: Amplitrex AT1000 Advanced Digital Tube Tester\n","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/BRIMARCV133_2.jpg?v=1783356778","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/BRIMARCV133_5.jpg?v=1783356778","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/BRIMARCV133_3.jpg?v=1783356778","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/BRIMARCV133_1.png?v=1783356779","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/BRIMARCV133_4.png?v=1783356779","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/Untitled_design_2_d3e80697-4d39-450d-a197-513a2fa0a988.jpg?v=1783499577"],"price":136,"currency":"USD","in_stock":true,"inventory_qty":59994,"dynamic_pricing":false,"listed_at":"2026-07-08T04:00:47.265Z"},"share_url":"https://firestarter.network/l/lst_cewxqgDC","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_cewxqgDC' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Brimar CV133/ 6C4/ EC90 1960s Military Grade Vacuum Tube' and a budget_max comfortably above $136.00 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."]}}