Backbore effect on intonation?

[Grumpikins]

The most basic guideline (were someone to goad me into offering one up) with mouthpieces would be to compare a bass tuba to an alto sax, and a contrabass tuba to a tenor sax. "Stick with alto sax sized mouthpieces when playing an alto sax, and stick with tenor sax sized mouthpieces when playing a tenor sax"...

...but people break that super-general/super-liberally-worded rule as well, and plenty of tuba players do the same... The really great thing about any of that: It ain't me, and I'm fine with others doing whatever with their stuff.

This is exactly what I think is the issue with the eb horn I'm messing around with. I dont have a mp that is the correct size relative to this horn. The reciever size is the biggest obstacle also. I know you have said that you typically remove and run a taper in them to american shank size. I have considered that, but I want to leave that as a last resort. Lol. The best solution is always the last one you try. Right...

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[bloke]

If it's small shank...AND a small E-flat tuba...
(yes, I have sort-of expensive stuff I can sell you in small shank, but)...

...What about seeing if you can find a USED small Denis Wick tuba mouthpiece in small shank...??

such as a 4 or 5 (with NO "L" after the number...??)

[Grumpikins]

I have access to cnc equipment, and this is a fun side project for me. I'm not trying to create the 8th wonder or market a product. Just a less expensive way for me to create something I need. If it doesn't work out, aka sucks, I'll probably go that route (denis wick?).

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[Pauvog1]

I noticed more change in resistance/feel and tone than pitch on my modular Sellmansberger/Houser mouthpieces.