http://cgi.ebay.com/R-Otto-Weller-F-Bb- ... dZViewItem
... I don't see any double rotors (or change valves, for that matter) ...

Wow! With a quad tuba (open, 5th, 6th, 5th AND 6th) and without those pesky quad plumbed valves imagine what you could do!vsvs2002 wrote:(four valves plus 2 change valves)