PGU-1 1940
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Portable PGU-1 loud-speaking installation was manufactured by plant No. 2 of GUPP NKS since 1940. The installation is designed to enhance speech and music programs in large indoor spaces and small open spaces and can serve an audience of up to 3.5 thousand people. It works on two remote speakers with a capacity of 6 watts each.
Documentation:
Information from collection of Valery Khartchenko