![]() They support and align the valve core which eliminates surface wear and allows for an air-tight seal, two issues that have been problematic in the axial flow valve design since it first appeared in the 1980's. These bearings are similar to those used in precision machine andautomotive applications. The "Infinity" thayer axial flow (AF) valve on this model is unique in that it employs an upper and lower roller bearing assembly to support the valve core. New for 2011, the 42AF is the replacement for the venerable 42T and features three major improvements over the earlier model. It is especially well suited for orchestral work, where it can disappear into, subtly blend with or completely dominate an ensemble. ![]() Like many of Vincent Bach's designs, it is famous for its ability to"slot," and for its uniformity of tone throughout its scale and dynamic range. The 42's characteristic sound is dark and resonant, with little edge and great carrying power. It has been copied in whole or part by many other makers, from large manufacturers to small specialty makers. ![]() The Bach 42 series trombone has defined the modern symphonic trombone sound. The Bach Stradivarius 42AF is a professional large bore (0.547") symphonic trombone with a new generation "Infinity" Thayer valve and open wrap F attachment. Bach Trombone Outfit w/Infinity Axial Flow Valve.
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