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With the Conn 15J (pre-1985) tuba... you changed the leadpipe and swapped the 1st and 3rd tuning slides. It was then a shoulder-fired marching tuba.

It helps in picturing this to realize that unlike old contrabass bugles or the shoulder tubas we have today, the 15J in marching configuration sat on your right shoulder.

(My HS band marched these starting in 1978. I really enjoyed them in this configuration)

TubaTinker wrote:With the Conn 15J (pre-1985) tuba... you changed the leadpipe and swapped the 1st and 3rd tuning slides. It was then a shoulder-fired marching tuba.

Ok, that makes sense. I was looking at that listing and wondering the same thing....Thanks for clarifying!