TubeNet

I would like to know where one would put a serial number to identify a tuba. Is there a website or giant log of serial numbers for each company. Just something I would like to know.

I'm not sure exactly what you're asking. But... if you are looking for serial number lists... go here:
http://www.musictrader.com/serialnos.html

If you are looking for the serial number on your horn and simply can't find it... some horns just don't have serial numbers.... as is the case with many of the recent imports.

Yeah, something like that. Thanks.