early tiny Conn Eb tubas

[jacobg]

Does anyone have any info about very early, very small Conn Eb tubas? In particular, does anyone have pre-1920's Conn basses catalog scans?
I have a mouthpiece probably from the teens marked "Conn S". It's wonderfully small and stubby and is the shank size in between tuba and bass trombone. I think it belonged to one of these small tubas. I also think these are the tubas that can never play in tune with any other mouthpiece.
Does anyone have one?
thanks
j

[1895King]

I have instrument #35775 that I purchased last spring. I'm using a Bach 25 that I had the shank turned down on about 17 or 18 years ago. It seems to play in tune that way.

[MaryAnn]

I have a McClellan 3/4 Eb that may be from that era. I had the mpc shank turned to a Morse 0 taper so it fits, but....the tuba does not play in tune. The high range is sharp wrt the low range, and I've never found a way to fix that so I don't play that tuba. It just sits. I'd be interested to find a piece that would make the thing play in tune, because it is quite playable otherwise, despite only three valves. The false tones are completely useable.

MA

[Bob Kolada]

I have 2 old Eb tubas that I play often (a Giant and a small one) and the key with the intonation seems to be tuning the horn to the 2nd partial and using a few different fingerings if need be higher up. Also, buzzing the exact pitch like you owe it money.

I used an American shank Bach 18 in my old small shank small Conn Eb with absolutely no problems, a shallow no-name 30mm in my small (may actually be the medium) King Eb and a PT48 in my Conn Giant with very few problems (and they're there with different mouthpieces as well).

The few I've tried actually don't work that well in a bass trombone or euphonium, though a modern contrabass trombone mouthpiece does. I don't know why. My contrabone mp is actually deeper than the no-name.