Kontrabasstuba wrote: ↑Sun Sep 04, 2022 1:11 pm
Ah... it was a few post's lower. There was a nice Eb Tuba. Was a post from @Yorkboy
These tubas are typically 11/16" (nearly 17.5mm) bore - NO expansion for #4 and #5 (rotor) is typically 3/4" (just under 19mm) bore.
The only similar instruments that were sort-of) "mass"-produced (not all that many of either, honestly) in somewhat recent times were a Getzen-assembled product (defunct) and a Holton-built product (old-OLD tooling dusted off, but now also defunct, and bell was an inch smaller - to specifically suit Harvey Phillips).
King, King-alike, and cut-down-to-C King (aka "Conn") and Chinese King/Conn-alikes are similar, but slightly larger.
Between 4+1 (modified/updated) 4/4 Holton-or-York (EXTREMELY similar) B-flats, and King/King-like B-flat instruments, I personally prefer the Holton/York instruments. As far as the C versions, I've not played a "wonderfully in-tune" cut-to-C Holton/York, but the Eastman C versions of a very nicely shortened-to-C King seem successful/popular. I'm just personally not in the market for anything in this size range in C, and prefer my subtly/smaller-than-King Holton instrument (4+1) in its full/original B-flat length (to any of the others mentioned).