TubeNet

Hi all,

I picked up a batch of parts on Ebay, and among them was a set of Conn valves that are 1.065 in diameter with ports that measure .718, which appears to be a Conn #10 bore. There are other parts too which suggest these are from a sousaphone. I'm hoping to pick up a beater sans pistons (cheap) that these might fit. That said, I don't need a sousaphone and am hoping they fit a more traditional bass. (I know--crazy thing to hope for, but stranger things have happened.) Conn Loyalist is missing bore size listings on most of the tubas, and doesn't show any at all that are a #10 bore. Did Conn make #10 bore tubas? If not, what was so special about that size that made them think it was only suited to sousaphones?

Thanks

14K is the standard .730 bore. I'm thinking Eb, but that may have been .690.

Pretty sure they're Conn. Christmas tree buttons and the top caps look right.

Conn Loyalist has several sousaphones listed as being this bore, including the 10K, 14K, and 22K.