An unlacquered hybrid horn, usually a Kruspe-wrap horn. One part of the horn must be nickel silver, and the other part must be yellow brass (an example is a Patterson-modified nickel silver 8D with a Conn yellow brass first branch). A Frankenhorn must be able to play stupidly loud in an orchestral setting and it should be very easy to play very loud.
When our asst. principal horn played the Frankenhorn, he played so loud in the first movement of Tchaikovsky 5 it caused the fourth horn to get really mad at him.
by Amberstream April 25, 2017