Avalon ST-4 Matching Vacuum Tube Set for VT-737SP and VT-747SP

The 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.

For 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.

Proper 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.

Key Features of the Avalon ST-4 Tube Replacement Kit

• Factory-Matched Quad Set: 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.
• Military-Grade 6922 Tubes: 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.
• Designed for VT-737SP and VT-747SP: Purpose-built as the spare tube kit for both Avalon units, eliminating compatibility concerns and protecting the investment in your studio hardware.
• Maintains Class-A Tube Circuit Integrity: Correctly matched tubes preserve the balanced gain staging that Avalon's Class-A topology requires, keeping harmonic response consistent across the full signal path.
• Genuine Avalon Replacement: Sourced directly through Avalon's authorized supply chain, ensuring you receive the same tube specification installed at the factory.

Technical Specifications

• Model: ST-4
• Brand: Avalon
• Tube Type: 6922 (military specification)
• Quantity: 4 matched tubes
• Compatible Units: Avalon VT-737SP, Avalon VT-747SP

What's Included

• 4x matched military-spec 6922 vacuum tubes