{"type":"firestarter.listing","listing":{"id":"lst_9HtNAphM","product_name":"GUSTARD H26 Fully-balanced Class-A Amplifier and Preamplifier","category":"DAC (Digital-to-Analog Converter)","description":"Discrete Class A headphone amp and preamp\nThe Gustard H26 is a fully-balanced discrete Class-A headphone amplifier and preamp built for listeners who want control, power, and flexibility in one chassis. With a balanced signal path, matrix relay volume, dual toroidal transformers, and both headphone and preamp output modes, it fits into a desk system or a speaker chain without compromise. \nFully-balanced discrete Class-A design\nThe H26 uses a fully-balanced discrete Class-A circuit with eight pairs of power transistors. Discrete components allow each stage to be tuned independently, giving the amplifier tighter control over distortion and current delivery. \nSwitchable preamp and headphone modes\nThe headphone amplifier stage can be turned off independently, allowing the H26 to operate as a dedicated preamp. Preamp outputs can also be disabled, making it easy to move between headphone listening and a speaker chain without unplugging cables or changing connections.\nMatrix relay volume control\nVolume is handled by a matrix relay system designed to maintain channel balance across all levels. Instead of relying on a traditional potentiometer, the relay network keeps left and right channels aligned, reducing imbalance at low listening levels and keeping volume changes stable.\nBalanced input stage with RCA compatibility\nThe input stage is fully-balanced, with a single-ended to balanced conversion for RCA inputs. This allows single-ended sources to benefit from the balanced architecture, improving noise rejection and signal stability as the audio moves through the amplifier.\nDedicated preamp circuitry with LME49720 op-amps\nThe preamp stage uses two direct-inserted LME49720 dual op-amps. These are widely used for their low noise and linear performance, helping preserve signal integrity before amplification and maintaining clarity across the frequency range.\nDual toroidal power supply design\nPower is handled by two 50W custom toroidal transformers (one per channel). Separating 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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_9HtNAphM' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy GUSTARD H26 Fully-balanced Class-A Amplifier and Preamplifier' and a budget_max comfortably above $1149.99 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."]}}