Portable loudspeaker installation "PGU-1".
Amplifying and broadcasting equipmentThe portable loudspeaker unit "PGU-1" has been produced by the plant No. 2 GUPP NKS since 1940. The installation is designed to enhance speech and music programs in large enclosed spaces and small open areas and can serve an audience of up to 3.5 thousand people. It operates on two 6W external loudspeakers.