{"type":"firestarter.listing","listing":{"id":"lst_SjBtrJUJ","product_name":"xDuoo TA-20 Plus Balanced Tube Headphone Amplifier","category":"Headphone Amp (Tube)","description":"\n\n\nFully balanced and purely mesmerizing\n\n\nBuilt on a fully-balanced circuit from input to output, the TA-20 Plus ensures an improvement in crosstalk, resolution, and SNR. This balanced architecture paves the way for a captivating, clear sound that envelops you in its richness.\n2000mW of punch\nDon’t let the size fool you. The TA-20 Plus is capable of outputting up to 2000mW of power, making it suitable to drive headphones with impedances ranging from 16 to 600Ω. Switch between the 4-pin XLR and 4.4mm balanced headphone output to get the most out of your headphones.\nTube Rectification: a vintage touch in a modern world\nEquipped with 5Z4P tubes for rectification, the TA-20 Plus adds that much-coveted \"tube\" character to your sound. This means you're getting the best of both worlds: modern performance and vintage warmth.\nDouble the tubes, double the fun\nThe device uses two meticulously matched 12AU7 tubes for audio processing. This lends a unique warmth and softness to the sound, providing a fatigue-free listening experience. And hey, they’re rollable, so go ahead and switch them out to fine-tune your audio palette.\nGet in sync\nNothing quite compares to watching a VU meter dance to the beat of your music. The TA-20 Plus includes a retro mechanical VU meter that not only gives you real-time output levels but also adds a bit of fun to your audio setup.\nClass A Buffer: a perfect hybrid\nBy combining tube and transistor technologies in a hybrid amplifier structure, this Class A buffer amplifier offers a robust output that can easily drive many kinds of headphones, while preserving the nuance and subtlety in the sound.\nCustomized capacitance\nFor the true enthusiasts, we’ve got customized HIFI capacitors that enhance the audio output and provide pure, sweet sound quality.\nMultiple inputs/outputs for the flexible listener\nWith its varied input/output options like two RCA, one XLR, and one 4.4mm balanced input, this device gives you the freedom to easily switch between differen","images":["https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198667309292.jpg?v=1741111770","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198667342060.jpg?v=1741111770","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta20-plus-balanced-tube-headphone-amplifier-39198668325100.png?v=1741111770","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198802903276.png?v=1741111771","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta20-plus-balanced-tube-headphone-amplifier-39198668423404.png?v=1741111771","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198668259564.png?v=1741111771","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198668161260.png?v=1741111771","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta20-plus-balanced-tube-headphone-amplifier-39198668357868.png?v=1741111771","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta20-plus-balanced-tube-headphone-amplifier-39198668292332.png?v=1741111771","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta20-plus-balanced-tube-headphone-amplifier-39198668488940.png?v=1741111771","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198668194028.png?v=1741111771","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198668456172.png?v=1741111772","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198667505900.jpg?v=1741111772","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198667538668.jpg?v=1741111772","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198667702508.jpg?v=1741111772","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta20-plus-balanced-tube-headphone-amplifier-39198668226796.png?v=1741111772","https://cdn.shopify.com/s/files/1/0225/2721/3642/files/apos-audio-xduoo-headphone-amp-tube-xduoo-ta-20-plus-balanced-tube-headphone-amplifier-39198667636972.jpg?v=1741111772"],"price":499,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T16:25:59.088Z"},"share_url":"https://firestarter.network/l/lst_SjBtrJUJ","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_SjBtrJUJ' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy xDuoo TA-20 Plus Balanced Tube Headphone Amplifier' and a budget_max comfortably above $499.00 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."]}}