ABSTRACT
The control on a preamplifier or audio receiver, or even a monitor-type TV set, that allows the user to choose one signal source from multiple inputs hooked up to the system.
HOWARD FERSTLER
Records made for nonretail purposes, mostly in the 1930s and 1940s, by a direct to disc process. The material used was typically aluminum, coated with acetate or a nitrate lacquer to make a soft surface. The use of acetate gave the popular name “acetates” to these recordings.
