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In page Sousaphone:

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Although most major instrument manufacturers have made, and many continue to make, sousaphones, Conn and King (H. N. White) instruments are generally agreed among players to be the standards against which other sousaphones are judged for tone quality and playability.[citation needed] Perhaps the most highly regarded sousaphone ever built is the 0.734-inch-bore (18.6 mm) Conn model 20K, introduced in the mid-1930s and still in production. Some players, especially those who find the 20K too heavy for marching, prefer the slightly smaller 0.687-inch-bore (17.4 mm) King model 1250, first made in the late 1920s and also still in production as model 2350. Historically, Holton, York and Martin sousaphones have also been considered fine horns.