I think the tuba's a much heavier calibre than that.If you ask me, that looks like a fairly low-calibre anti-personnel trombone.
(
barryheadwound Mul-ti-pass? Multipass!,
Wed 16 Mar 2011, 13:01,
archived)
in the same category as the sub-machine bagpipes
(
Paul_P http://www.Paul-hub.com,
Wed 16 Mar 2011, 13:29,
archived)