Hans Pizka <[email protected]> wrote:

   If you buy the valve section, you could make a horn just using  
   hammer(s)  & file(s) & different balls & a scissor & tools for  
   soldering & mandrels & etc.

Hans -- You forgot fire!  Without fire you cannot build a bell with a
hammer.

Returning to your earlier message, I'm inclined to agree that mechanical
complexity has a cost.  (The notion of adding valves to the horn was by
itself something of a tradeoff!)  But I can think of reasons why a
builder might want to experiment with doubled valves.  One possibility
is that it would allow an air path without sharp turns.  (But the
typical Pumpenhorn does not exploit this possible advantage.)

Hmmm.  Consider the great step forward for the trombone when the Thayer
valve was invented.  (See http://en.wikipedia.org/wiki/Thayer_Valve) Has
anyone ever experimented with these on a horn?  It would seem
mechanically unproblematic, except perhaps for devising adjustable valve
slides.  Such an instrument could respond more consistently with
multiple valve fingeings.
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