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Alrighty...I currently am trying to play my F on my PT-50 because that's the only mouthpiece I own. I desperately need a F mouthpiece, but am clueless on what to buy. Can anyone suggest a mouthpiece that would go well with a German Sanders F tuba. I have a semi bright tone with my PT on the F and am trying to find a mouthpiece that will sing in the high registers, but at the same time wont be piercing (no bobo sound) (GASP! BLASPHEMY.) Can anyone suggest anything?

Though most will tell you to go with a shallow bowl cup, I always preferred the deep funnel, like a Schilke 66 or G+W Matanuska.

PT-72

This is highly YMMV, just like trumpetters and piccolo mouthpieces. Some like small and shallow, while others have workable chops on regular mouthpieces and like the big, dark sound.

Just like those trumpetters, remember that it doesn't matter what length the instrument is, you've still got to buzz the same note. Some people don't need any help, some need some assistance. It varies from person to person.

What I'd recommend is that you take YOUR horn to somewhere you can try a bunch of different types, or at least do that on trial over the mail.

You'll get a lot of different answers here, from the range that people use. I use a TU27 on my Meinl, which although shallow, gives it a big, dark sound.

You need what works for YOU, on YOUR horn.

im a huge fa of the bobo solo on my firebird, and of the laskey 28f

Suggest looking at Joe Murphy's LOUD mouthpiece line. The LM-15 is an excellent F tuba 'piece. The cup design is unique, and works very well.

Gotta agree with Windshieldbug, go out to your nearest dealer and try a bunch. or find a company (like GW) that will send you their line through the mail.

FWIW, I use my GW Caver on a PT-16 for F work

I enjoy the PT-64 (I second the above vote) and the (gasp!) Bobo Solo mouthpiece. If you're content with your PT-50, maybe, try the Perantucci first.

PT-64, PT-65, or PT-66. Also consider getting it in the smaller shank. I use a PT-65s, the s means standard shank i.e.e smaller shank, myself and it is the best match I have experienced for me.

I have had wonderful experience with dealing with Ivan Giddings at G and W mouthpieces. If you could get anywhere near him and try several mouthpieces, you would find one very quickly. One of the other posters, here, suggested using his Matanuska and, since I use one on my Willson 3400S, I can concur with that as a general mouthpiece but, I recently got a Churada for doing solo work and I really love it. It makes the high tones sing yet allows the low tones to speak very clearly. You might check availability of shank sizes to see if he has the proper one for your horn (I don't know if you need a Euro or a standard shank). Ivan is a good guy to deal with. It would be slower but you could do this experimenting by mail, if you can not get to him when he has a line of mouthpieces with him.

If you like a deeper cup, Wick 3 or 3L are two to try; if you like a shallower cup, Wick 3SL or Mike Finn 4 are great.

And in the interests of leaving no stone unturned:
The Miraphone TU13 is, I think, their official F mouthpiece. It's a fat rimmed job of medium-shallow depth. Easy to play. I don't know where you can get one now that WWBW no longer lists it.