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I know the following tech. He worked on my Bach Strad 50B3 and converted the linkage when he was in Az.

Email: eric@proinstrumentrepair.com" target="_blank
Website: Professional Instrument Repair
Your real name: Eric Edwards
Occupation/School: Brass Craftsman
Dallas/Ft.Worth Texas
http://www.proinstrumentrepair.com

I do not know about his tuba repair but he has a good rep on the trombone forum. I would trust him with my tuba.

I recommend Curtis Wood in North Houston. He does the best bell repair job i've ever seen. I have a few more recommendations in Austin/San Antonio area, if you are interested.

I second Curtis Wood. I've had several friends recommend him.