screamingmorris

Conn implied that Coprion (copper) gave its instruments less resistance.

Regarding the Conn 9A
The Conn Loyalist
says
"9A has a one-piece Coprion mouthpipe-mouthpiece receiver with a micro-finished interior, and a one-piece Coprion bell. It has a darker sound than the 5A, and a "medium-large bore" feel."

But regarding the Conn 5A
The Conn Loyalist
says
"The 5A is the non-Coprion version of the 9A...
5A has a nickel-silver mouthpipe and brass bell. This model has a "medium-bore" feel."

So the copper leadpipe and copper bell change the resistance from the 5A's "medium" bore feel to the 9A's "medium-large" bore feel.

Why?
Did copper / Coprion have a smoother surface which allowed for freer air flow?

- Morris

Brass crusader

Morris,
I know that the Coprion bells were pure copper, plated onto a mandrel, allowing a perfect mold. I don't really know the technical or scientific specs, but I recently sold a 17b Coprion Director. This horn was an absolute screamer! It was easy to play, and could peel paint anywhere. It didn't play with too much resistence, and I couldn't crack a note...I tried!
Hope this helps.

__________________
~Brass Crusader

Yamaha Xeno Custom w/ reverse leadpipe
1947 Olds Super Recording trumpet
1947 Olds Special trumpet
1952 Olds Ambassador cornet
1967 Olds Special cornet
1970's Yamaha 631 Flugel w/ Rose brass bell
1970's Conn 17b Coprion director
Other assorted Conns and Olds
Yamaha and Bach Mouthpieces
1929 Martin Handcraft "The New Master"
1935 Conn 22B NY Symphony Special tpt
'83 Callet New York Super Large Bore trpt.
'35 Conn 32H trombone

Dale Proctor

Subjective advertising copy. Who knows if it's true? I suppose if you owned both cornets and could do a side-by-side test, you could come to your own conclusions. I do believe the 9A's Coprion mouthpipe is plated over a sleeve, possibly stainless steel. I looked down the mouthpipe of my 6B, which has a similarly-made mouthpipe, and there's a shiny (even after 48 years), silver-colored lining inside. It looks like a one piece part, too. My 5A has a nickel mouthpipe that's made up of 3 parts. The 9A Coprion bell is obviously a one-piece, seamless part, also, while the 5A has a two-piece brass bell. As for the 5A having the feel of a medium bore, maybe it has the feel of a medium bore Conn, but it feels pretty big to me when I compare it to my large bore Bach. Actually, it is big - a .485 bore. Now, the brass Director cornet of the era also has a .485 bore, and plays very differently; easier, like a medium bore, with a much brighter sound.

Anyway, I'm just rambling, but the point I'm trying to make is that while the Coprion parts obviously affect the way the 9A plays, it's also constructed differently than the 5A. I'd guess this also plays a part in the differences, whatever they may be.

__________________
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Olde Towne Brass
www.otbrass.com

Brass Band of Huntsville
www.brassbandofhuntsville.org