Trombone Life - Brass Toff Brass Instrument Repairs

Conn 88H Bell Restoration: Precision Mandrel Reshaping and Mechanical Analysis

Leave a Comment / Trombone / Russ Marsh / February 12, 2026

The Conn 88H trombone arrived with a significant structural deformation in the rose brass bell section, specifically located prior to the flare. A high-impact collision had compressed the wall thickness and compromised the internal geometry. Such physical trauma introduces resistance to the air column and disrupts the standing wave essential for acoustic projection. In our […]

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Precision Diagnostics: The Physics of Trombone Slide Regulation

Leave a Comment / Trombone / Russ Marsh / February 8, 2026

When resistance is felt in a brass instrument, specifically the slide of a trombone, the issue is often a breach of critical mechanical tolerance. A smoothly functioning slide requires a near-zero coefficient of friction, maintained by a thin layer of lubrication between the inner nickel stocking and the outer brass casing. Physical debrismineral deposits from

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Precision Diagnostics: Restoring Critical Valve Tolerances in Brass Instruments

Leave a Comment / Trumpet / Russ Marsh / February 8, 2026

Instruments frequently arrive exhibiting severe internal contamination. Deposits range from bio-film residue to crystallized calcium carbonate (calcification), particularly prevalent in the third valve slide area. This material disrupts the critical clearance tolerances necessary for proper function. When assessing a severely impacted trumpet, the initial phase is diagnosis: quantifying the deformation and structural compromise before any

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