A better option than putting a YEB-321 valveset on an old monster EEb would be just to use a YEB-321. If you get a used one, probably cheaper in the end, also.
Plenty of individuals have successfully used that model in band and orchestra settings (despite the number of posters on this site who say it can't be done . . .).
Living with Monster Eb's
- Uncle Buck
- 5 valves

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- Chuck(G)
- 6 valves

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It may be much simpler than that. Consider that York used the same bottom bow and bell for the Monster Eb and thier 4/4 BBb. The problem then boils down to how to get from the end of the mouthpiece to the bottom bow without getting things too far out of whack with a screwy taper.Bob1062 wrote:Why do these horns have bad intonation? Is it a large mouthpiece thing? Tiny valve bore?
I submit that it's difficult.