I played my 1924 Buescher tuba for years with one of the adapters to standard American shank that Matt Walters used to make. In fact, I think it was the last one of these he made. I still have it, but no longer use it. I was never truly happy with it, no matter what mouthpiece I used. Intonation just wasn't quite right.
Last year I finally replaced the original (European small tuba shank) receiver on it with a standard American one. It probably took me only about a half hour, including making a little "sleeve" to match the OD of the mouthpipe to the ID of the new mouthpiece receiver, and testing and tinkering with the length of that to get the pitch/intonation exactly where I wanted it. This resulted in a surprising and amazing difference, and the horn now plays very well in tune (modulo a couple of minor typical 3-valve tuba issues) and with a great sound. I typically use my Schilke 66 mouthpiece on it now, but am still experimenting now and then with a Miraphone T17 and a Kelly 25. In any event, it's MUCH better than it ever was with any mouthpiece and the adapter, and better than it ever was with any correctly fitting mouthpiece I ever tried in the original small receiver.
There is a lot of "ideology" about what kind of mouthpieces these old Eb tubas with the small receivers "like". My experience has differed from that, although that may be because I wanted a particular "good sound" and sound quality rather than an historically correct result. But I wouldn't know the historically correct result if I heard it, and I doubt that many others would either. 
Anyhow ... An adapter is not a long-term way to go with these things. Either find a currently made mouthpiece that works with it for you, have one made that fits it and you like (Doug Elliott would be a good way to go here and probably save you money in the long run), or change out the receiver and see how that works with a mouthpiece with a different shank.
Gary Merrill
Wessex EEb Bass tuba (PT-63)
Mack Brass Compensating Euph (DE N106, Euph J, J9 euph)
Amati Oval Euph (DE N106, Euph J, J6 euph)
1924 Buescher 3-valve Eb tuba (with std US receiver), Kellyberg
Schiller American Heritage 7B clone bass trombone (DE LB K/K9/112 Lexan, Brass Ark MV50R)
1947 Olds "Standard" trombone (Olds #3)
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