TubeNet

Hmmm ...

http://cgi.ebay.com/R-Otto-Weller-F-Bb- ... dZViewItem

... I don't see any double rotors (or change valves, for that matter) ...

No wonder I don't play as well on a 6-valve horn; 2 of them are for key changes!

vsvs2002 wrote:(four valves plus 2 change valves)

Wow! With a quad tuba (open, 5th, 6th, 5th AND 6th) and without those pesky quad plumbed valves imagine what you could do!

I'm going to design a quad horn; imagine what those horn players would pay for one!