York monster E flat tubas (as well as the 19" bell flare BB flats) are .656, same as the Conn 2,3,4 & 5J horns.
I've also seen similar pitched and sized Holtons with that same bore.
bloke wrote:Some of the front-action non-comp. Eb tubas feature larger bore sizes, (2141...PT-22P...etc...) It doesn't seem as though folks brag on the intonation characteristics of those tubas, but I wouldn't necessarily rush to use "the bore" as the "whipping boy" for the intonation characteristics of those models.
I agree with bloke, in that the bore is not as important regarding intonation, as is bugle taper and bell throat diameter.
(I have a secret theory that selection of bore size, at least in the old days, were not necessarily made for only sonic reasons.)
"Even a broken clock is right twice a day".