Posted by Matt W. on February 20, 2000 at 09:44:04:
In Reply to: Re: Re: 5/4+6/4 bore sizes posted by Chuck Jackson on February 20, 2000 at 02:41:36:
In the old days, Germans designated horns based upon bell diameter. The horns were proportioned based upon the size of the bell. 45cm (17 3/4") being a 4/4 and 50cm (19 7/8") being a 5/4 size tuba. Bigger horn bigger bore.