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Czesław Klimczewski, "Speaker power amplifier"
Many schools, club rooms and radioamateur wheels have radio receivers but they lack amplifiers, which would enable the playback of programs by a larger number of loudspeakers installed in the rooms. For those amateurs a description of the power amplifier with the method of its assembly is given. The amplifier connected in a suitable way to the radio receiver will allow to obtain the necessary electric power for powering several loudspeakers with a total power of about 15 or 20 watts, depending on the type of radio tubes used.