{"product_id":"avalon-design-st-4-recording-accessories","title":"Avalon Design ST-4 Matched Vacuum Tube Set for VT-737SP \u0026 VT-747SP","description":"\u003ch2\u003eAvalon ST-4 Matching Vacuum Tube Set for VT-737SP and VT-747SP\u003c\/h2\u003e\n\n\u003cp\u003eThe Avalon ST-4 Matching Vacuum Tube Set is the factory-recommended spare tube kit for the Avalon VT-737SP microphone preamplifier and the VT-747SP program equalizer\/compressor, delivering four matched military-grade 6922 tubes that restore the full sonic character of these world-class channel strip units. When it comes to maintaining the warm, transparent performance these processors are known for, the ST-4 ensures you're always working with correctly matched, professionally graded tubes.\u003c\/p\u003e\n\n\u003cp\u003eFor engineers sourcing replacement tubes for the Avalon VT-737SP or seeking the best matched tubes for their Avalon channel strip, the ST-4 eliminates the guesswork of third-party tube matching. Military-spec 6922 tubes are selected and matched at the factory to the tight tolerances that Avalon's Class-A tube circuits demand, making this the definitive maintenance solution for both units.\u003c\/p\u003e\n\n\u003cp\u003eProper tube replacement in high-end studio hardware requires matched sets to preserve balanced gain staging and consistent harmonic response across both channels. The ST-4's military-specification 6922 tubes are a designation long associated with tighter construction tolerances, lower noise floors, and extended service life compared to standard commercial-grade equivalents -- qualities that matter in professional studio environments where signal integrity is non-negotiable.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features of the Avalon ST-4 Tube Replacement Kit\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFactory-Matched Quad Set:\u003c\/strong\u003e Includes four 6922 vacuum tubes matched to Avalon's specifications, ensuring balanced performance and consistent gain across the signal path in your VT-737SP or VT-747SP.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMilitary-Grade 6922 Tubes:\u003c\/strong\u003e Military-specification grading delivers tighter construction tolerances and lower noise than standard commercial equivalents, preserving the low-noise, high-headroom character these preamps are built for.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDesigned for VT-737SP and VT-747SP:\u003c\/strong\u003e Purpose-built as the spare tube kit for both Avalon units, eliminating compatibility concerns and protecting the investment in your studio hardware.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaintains Class-A Tube Circuit Integrity:\u003c\/strong\u003e Correctly matched tubes preserve the balanced gain staging that Avalon's Class-A topology requires, keeping harmonic response consistent across the full signal path.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGenuine Avalon Replacement:\u003c\/strong\u003e Sourced directly through Avalon's authorized supply chain, ensuring you receive the same tube specification installed at the factory.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e ST-4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Avalon\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTube Type:\u003c\/strong\u003e 6922 (military specification)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 4 matched tubes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Units:\u003c\/strong\u003e Avalon VT-737SP, Avalon VT-747SP\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e4x matched military-spec 6922 vacuum tubes\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Avalon Design","offers":[{"title":"Default Title","offer_id":46154833330373,"sku":"AVLN-ACC-ST4","price":250.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0630\/3085\/3829\/files\/6c8fa32eaf984ccaa3acf5524ee6c5fd_d41da4ed-1809-4ead-ab05-86187af054bf.jpg?v=1777568697","url":"https:\/\/avlgear.com\/products\/avalon-design-st-4-recording-accessories","provider":"AVLGEAR","version":"1.0","type":"link"}