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A while back a band mate let me try a mouthpiece that was made by Kanstul. It was stamped "Kanstul Eb F". I recall really liking it in his old King 3 valve Eb. I recall it having a shallow cup. A look online seemed to suggest that @Lee Stofer had something to do with the design?

I was wondering if there is anything similar in current production.
If anyone has any measurements or specifications...I would greatly appreciate it.

I found one on eBay but it is euro shank and the seller doesn't provide any detail on the description.

From what I remember, Lee gave then an RM 9 to copy. The Kanstul Eb/F mouthpiece is very heavily influenced by that Rudolf Meinl mouthpiece. Lee can probably give you more information on this.

Many years ago… Mirafone made a mouthpiece labeled “Eb F” and I want to say it was associated with someone possibly like R. Winston Morris.

Foggy, but… maybe “Eb F” = C8 = TU13. Maybe…

The Goog failed me.

Most places I look show this as a "TU13 (C8) Winston Morris" https://hornguys.com/products/miraphone-tuba-mouthpiece (Select TU13)
So seems correct from here . . .

MiBrassFS wrote: ↑Mon Aug 05, 2024 9:18 am Many years ago… Mirafone made a mouthpiece labeled “Eb F” and I want to say it was associated with someone possibly like R. Winston Morris.

Foggy, but… maybe “Eb F” = C8 = TU13. Maybe…

The Goog failed me.

That Eb F mouthpiece (or the 2 that I've seen) had pretty small shanks.

Yes indeed, I think every one of the Mirafone Eb F pieces I saw had a small (bass trombone-ish) sized shank.

Kanstul (or rather Jim New…) apparently made them in American and larger Euro shank. He’s still making mouthpieces…

I accompanied Zig Kanstul and Charles Hargett to the Musikmesse in Frankfurt, Germany, in March of 2010, where Kanstul was
introducing his line of York-like 4/4 BBb, CC, and the York monster-like Eb tubas. I carried my Stofer Geib mouthpiece with American shank,
and a Rudolf Meinl RM-9 / 7.8 backbore mouthpiece to use while showing these tubas at the Kanstul booth. I had told Mr. Kanstul that,
in my experience, his Bach 18 copy might work on the contrabass tubas, but not the Eb. I further elaborated that I had found that trying
to use a deep cup (or funnel) contrabass mouthpiece on an Eb tended to produce a muddy low range and make the instrument go flat in the
upper range, and not have a nice and clear characteristic sound in any range. I know that there can be exceptions, but this works as a general
rule.

A week or two after returning to the US, Mr. Kanstul called me one afternoon, asking me, "Now, what was that mouthpiece that you were going
on about, for Eb tuba?" I told him about this mouthpiece again. He said, "If I make one, what should I call it?" I replied, you could simply call it an Eb/F mouthpiece. I sent him my Rudolf Meinl RM9 / 7.8 to evaluate, and about two weeks later he returned it to me, along with a copy of the Kanstul EB/F mouthpiece. The Kanstul mouthpiece did differ somewhat from the Rudolf Meinl mouthpiece, but I thought that Kanstul's mouthpiece was possibly the best Eb/F tuba mouthpiece made in the USA at that time. I think that Jim New had a lot to do with that. It was designed to complement an Anglo-Saxon style instrument (such as a York), as opposed to a Czech/German-style instrument, and did quite well. Kanstul may have made some with a Euro-sized shank, but I do not remember trying anything like that.

The Rudolf Meinl RM9 / 7.8 is still available through Musik Thomann as far as I know. I now have some Robert Tucci and Schilke mouthpieces in stock, and have found the RT-65, RT-64 and RT-62, as well as the Schilke Helleberg II F to be very solid performers.