{"type":"firestarter.listing","listing":{"id":"lst_VRAOR4Z6","product_name":"Cayin HA-2A Desktop Tube Headphone Amplifier","category":"Headphone Amp (Tube)","description":"Transformer-coupled Class A headphone amp\nThe Cayin HA-2A is a transformer-coupled, single-ended Class A headphone amplifier built around vintage NOS vacuum tubes and wide-bandwidth EI transformers. It gives you three headphone outputs—6.35mm single-ended, 4.4mm balanced, and 4-pin XLR balanced—plus impedance matching (Low/Mid/High) so you can dial in the output for your headphones. On the back, you get both XLR and RCA analog inputs for pairing with your DAC, CD player, streamer, or any line-level source.\nVintage NOS tube circuit\nThe HA-2A uses five vintage NOS tubes chosen for specific roles in the circuit: two Amperex 17BF11 for single-ended Class A power amplification, two Amperex ECF82/6U8 for voltage amplification, and one RCA 17AX4GT rectifier for the preamp-stage plate supply. \nTransformer-coupled output stage\nThis is a transformer-coupled tube amp, which means the output transformer is doing the hard work of matching the tube stage to the headphone load. Cayin builds the wide-bandwidth EI output transformers for this model in-house, using a Z11 EI iron core and a hand-winding process, then encloses and resin-seals the transformers to reduce interference and keep performance consistent.\nImpedance matching for better control\nThe impedance selector lets the amplifier optimize output behavior for different headphone impedance ranges—Low (8–64Ω), Mid (65–250Ω), and High (251–600Ω). This helps the amp maintain control and keep bass definition steady as you move between different headphones. \n60-second start-up delay\nThere’s a built-in 60-second start-up delay circuit to protect the amplification stage, reduce pop noise at power-on, and let the tubes warm to a stable operating condition before playback. \nTube protection and microphonics control\nA tube protection cage keeps hands away from hot glass while also helping reduce interference around the tube area. The reinforced chassis base is designed to minimize microphonic ringing from impact and vibration.\nPoint-to","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316775.jpg?v=1768848067","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316774.jpg?v=1768848010","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316773.jpg?v=1768847107","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316772.jpg?v=1768847048","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316771.jpg?v=1768846988","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316770.jpg?v=1768846928","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316769.jpg?v=1768846868","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316768.jpg?v=1768846808","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316767.jpg?v=1768846749","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316766.jpg?v=1768852328","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316765.jpg?v=1768852267","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316764.jpg?v=1768852209","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316763.jpg?v=1768852149","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316762.jpg?v=1768852087","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316761.jpg?v=1768852029","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316760.jpg?v=1768851968","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316759.jpg?v=1768851907","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-cayin-headphone-amp-tube-cayin-ha-2a-desktop-tube-headphone-amplifier-1217316758.jpg?v=1768851849"],"price":1299,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:56.121Z"},"share_url":"https://firestarter.network/l/lst_VRAOR4Z6","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_VRAOR4Z6' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Cayin HA-2A Desktop Tube Headphone Amplifier' and a budget_max comfortably above $1299.00 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."]}}