TubeNet

If you haven't heard this orchestra, do yourself a favour and buy the DVD's. I own Mahler's 2nd,3rd, 6th and 7th Symphonies with Abbado at the helm and I can't say enough good things about them. Some of the best playing I have ever heard.

http://www.lucernefestival.ch/en/shop/DVDs/" target="_blank

A PT-6P being played on the one I have seen

Yep. Robin Haggart of the Liverpool Philharmonic is the regular tubist with the band