Many microphones in the collection come from the period 1920-1930. The collection contains precious types of the first carbon microphones, e.g. the microphone used in early stages of broadcasting of the Czechoslovak Radio (1923), several pieces of microphones of the system Reisz of the firm Marconi used in the Czechoslovak Radio in the 20s, and the chamber microphone Huth.
Several original electrodynamic microphones were made around 1930 (tape-type Siemens-Halske and coil-type Marconi, Philips and Standard Electric). The period after the World War II is represented mainly by electrostatic microphones Neumann and all other types (electrodynamic, electrostatic and piezoelectric of the firms Ronette, AKG and also Tesla).
The collection of amplifiers is incomplete.
The collection of loudspeakers provides a good outline of their development. It contains several important types, mainly electrodynamic loudspeakers including newer types.