In the UK the most common Tubas are Tubas in Eb. They come with various specifications as follows. 3 valves, 4 valves non-compensating & 4 valves compensating. These valves can be piston (Perinet) which can be upward (most common) or front facing, or rotary which are front facing.
Tubas in Eb are available in a silver plated finish or a lacquered finish.

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