[QUOTE=trumpetsplus;575441]Old Lou was mentioning his old and defective....
As a fellow instrument tech, are you exercising some common 'shop talk' about my "old and defective"?
I don't know of older trumpets and cornets built in this fashion, but Conn certainly made Baritone Horns with elliptical ports for exactly the reason of shortening the stroke.
That is 'probably' what I was remembering.
This thread has piqued my interest in short stroke valves to the point that I dug out a few of my 'classic' trumpets and cornets that my "old and defective MEMORY told me were purported to have such valves. The shortest valves and shortest stroke that I found in my 'accumilation' were found in my York Airflow cornet. The length of stroke was found to be .560". The length of the valve piston was 2.445". I have never seen such a short piston valve in my "ancient and defective memory". A VERY fine playing cornet in the bargain.