{"type":"firestarter.listing","listing":{"id":"lst_NhThIGPk","product_name":"RCA OD3/ VT139/ VR150 Vacuum Tube","category":"Vacuum Tube","description":"RCA produced this VT-139 / VR-150 / OD3 voltage regulator tube in the United States. Developed for industrial and communications equipment, this gas-filled regulator type helped maintain consistent operating voltages in tube-era power supplies. It features a black base, standard octal construction, and the characteristic internal electrode structure used in cold-cathode voltage regulator tubes.\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: RCA OD3 / VT139 / VR150\n\nGetter Type: Bottom Double \"D\" Getter\n\nBase Type: Black Base\n\nMade in: USA\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/RCAOD3_2.jpg?v=1783958230","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/RCAOD3_6.jpg?v=1783958230","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/RCAOD3_1.jpg?v=1783958230","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/RCAOD3_5.jpg?v=1783958230","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/RCAOD3_4.jpg?v=1783958230","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/RCAOD3_3.jpg?v=1783958230"],"price":175,"currency":"USD","in_stock":true,"inventory_qty":59994,"dynamic_pricing":false,"listed_at":"2026-07-14T19:44:25.327Z"},"share_url":"https://firestarter.network/l/lst_NhThIGPk","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_NhThIGPk' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy RCA OD3/ VT139/ VR150 Vacuum Tube' and a budget_max comfortably above $175.00 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."]}}