{"type":"firestarter.listing","listing":{"id":"lst_T14qf28S","product_name":"xDuoo MT-601s Tube Class-A Headphone Amplifier","category":"Headphone Amp (Tube)","description":"Time for a warm up\nThe xDuoo MT-601s combines the sumptuous warmth of a tube amplifier with the dynamics and speed of a transistor circuit for an amp that can handle any genre thrown its way. It’s a great purchase for anyone looking to pair the old-school tube sound to single-ended headphones, no matter their impedance.\nThe MT-601s is a reissue of the MT-601 featuring a 12AU7/ECC82 tube instead of a 6N11/E88CC tube.\nTube + Transistor\nA common complaint about tube amplifiers is their lack of high frequency response and resolving power. To overcome this, xDuoo added a rear transistor circuit capable of large dynamics, high speed, and resolving power. Together, they offer the best of both worlds. \nClass-A amplifier\nThe MT-601s is a class-A amplifier. Using simple circuits that draw the same amount of current and consume the same amount of energy whether receiving a signal or not, this is the most straightforward of amplifier types. It isn’t subject to electromagnetic interference caused by digital components, so its total harmonic distortion and signal-to-noise ratio are exceptionally low.\nTubes will roll\nAdventurous audiophiles will appreciate the ability to swap the stock tube for other tubes. Each tube has a different sound signature, adding or subtracting qualities like warmth, detail, and soundstage. It’s a fun way to play with the sound signature of a single amp, often for less than $30 a pop. Just be sure to find a reputable dealer of tubes before buying.\nDoubles as a preamplifier\nThe minimalist backplate provides only one RCA input and one RCA output. The latter can be used to connect the MT-601s to another amplifier or active speakers, affording either the sonic benefits of tube amplification. \nProduct highlights\n\nTube + transistor power\nClass-A amplifier\nAllows for tube swapping\nAmp can be used as preamplifier\n\nSpecs\n\nPower supply: DC24/2A\nOutput power: 200mW (32Ω)\n\nDynamic range: 85dB (32Ω)\nFrequency response: 10Hz-60kHz (+/-0.5dB)\nSuitable headphone impedan","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235658715372.jpg?v=1741112372","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235660288236.jpg?v=1741112372","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235654848748.jpg?v=1741112372","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235654619372.jpg?v=1741112372","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235654455532.jpg?v=1741112372","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235654291692.jpg?v=1741112373","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235654324460.jpg?v=1741112373","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235654881516.jpg?v=1741112373","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235653898476.jpg?v=1741112373","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235654652140.jpg?v=1741112373","https://cdn.shopify.com/s/files/1/0225/2721/3642/products/apos-audio-xduoo-headphone-amp-tube-xduoo-mt-601s-tube-class-a-headphone-amplifier-38235653669100.jpg?v=1741112373"],"price":89,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:59.729Z"},"share_url":"https://firestarter.network/l/lst_T14qf28S","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_T14qf28S' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy xDuoo MT-601s Tube Class-A Headphone Amplifier' and a budget_max comfortably above $89.00 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."]}}