TubeNet

This is the information I have found

"EUROPEAN SHANK: This is an increasingly popular shank size of about .530" diameter at the small end of the shank. It is found in mouthpieces like the JK Exclusive, Perantucci, Laskey "E" shank, and of course our wonderful Sheridan Series of mouthpieces. Most every European and American tuba built these days, will accept this shank size.

LARGE SHANK: This is a larger size that measures about .550" diameter at the small end of the shank. It works well on the larger European tubas. Especially horns with large diameter leadpipes like the "York" copies and most Alexander model 163 CC tubas. This is the size of our Dillon Music "L" shank mouthpiece and the new Wick 2XL."

Because the PT-606p is a "York" type tuba would a large shank mouthpiece be better than a European shank?
I currently play on a PT-88+ (gold plate) and my sounds is fine but I am unhappy with my intonation.

Any information is appreciated.

Thanks!

Anything larger than a Euro shank will not fit in the receiver of a 606(GR41). I found the PT44, 48, 50, and 84 worked well with that horn depending upon hall acoustics, indoor v. outdoor, etc. I have also used the Stofer Geib with great success. You might experiment with an American shank mouthpiece just to see if the difference in gap affects your results. YMMV