Impul's 1965
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Since 1965 the subscriber loudspeaker "Impulse" has produced the Makeevsky factory of household products "Impulse" (not exactly). AG is standard according to GOST 5961-59. It is designed for sounding radio programs transmitted over broadcast networks with a voltage of 30 volts. Rated power supplied to the AG of 0.15 watts. The range of reproducible sound frequencies is 150 ... 5000 Hz. Resistance on the terminals of the plug 6 kOhm. Dimensions 255x170x80 mm. Weight 750 g
Information from collection of Valery Khartchenko