TubeNet

Until somebody with better chops comes along, you're going to have to put up with mine. Even though the 14J has a large shank trombone receiver, you can get a regular tuba shank in far enough to stay.

Sooooo....
for your listening and comparison pleasure

Yamaha 65 in 14J:
http://t-recs.net/mpegs/tubenet/Yam65_14j.mp3

Yamaha 67B4 in 14J:
http://t-recs.net/mpegs/tubenet/Yam67B4_14j.mp3

And, by golly, the Orley and the Haunted House for my contribution to "white rap" thread is still on the web site.
viewtopic.php?t=11741
(scroll down a bit)