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Guitar tube combo "Maria" was produced at the Leningrad factory of plucked folk musical instruments. Lunacharsky since 1975. The combo was sold as a set: 2 combi Maria set of three guitars of the series of the same name Maria Rhythm, Leader and Bass. The electronic part, in the form of a chassis with an amplifier "Rhythm" was produced at the Lyubertsy plant of electro-musical instruments "Rodina". At the factory of Lunacharsky, only "boxes", pasted over with dermantine, were made, into which the amplifier chassis and dynamic heads were installed. If you remove the decorative front panel with the inscription "Maria", then under it will be the label of the amplifier "Rhythm". Characteristics of the amplifier-acoustic device: The range of reproducible frequencies with uneven frequency response / - 1.5 dB - 60 ... 12000 Hz. Rated output power at a load of 10 ohms - 20 watts. Maximum output power - 25 watts. Sensitivity Input-1 - 25 mV. Input-2 - 100 mV. The level of intrinsic noise and background of the amplifier is not more than 60 dB. The coefficient of nonlinear distortion at a frequency of 1000 Hz is not more than 1.5%. The tone control at frequencies of 100 and 10000 Hz with respect to 1000 Hz - 12 dB. Power speakers in the speaker 30 watts. The power consumption of 160 watts from the network. The weight of one combo 20 kg.