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Trombone Slide Regulation and Mechanical Repair | Brass Toff

Leave a Comment / Trombone / Russ Marsh / February 11, 2026

The diagnostic assessment of this Rath trombone revealed significant internal obstruction caused by desiccant lubricant residue and calcium deposits. These contaminants increase the coefficient of friction between the inner slide stockings and the outer slide walls. Clients from Runcorn frequently present instruments where the mechanical action has degraded due to the accumulation of particulate matter […]

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Tuba and Euphonium Repair: Mechanical Tolerances and Dent Removal Physics

Leave a Comment / Euphonium / Russ Marsh / February 9, 2026

Repair work often commences not with structural damage, but with the systematic removal of performance-degrading debris. The accumulation of calcified deposits and metallic particulates within the bore of a professional euphonium acts as a volumetric restriction, disrupting the laminar flow of the air column. This internal fouling creates an acoustic boundary layer perturbation, effectively shrinking

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