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The educational low-frequency amplifier "Demonstration" (code name) has been produced since 1959 by the Leningrad plant "Elektrodelo".
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The complete amplifier is shown in the first three photos.
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In the final stage, there could be a 6P3S or 6P6S radio tube.
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The maximum output power on the 6P6S radio tube reached 3 W and on the 6P3S radio tube - 5 W.
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The sensitivity of the amplifier was quite sufficient to amplify the signal from a piezoelectric pickup and a dynamic microphone with a transitional transformer.
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The output transformer had an output to a loudspeaker of appropriate power and an output to a radio transmitter, for using the amplifier as a modulator.
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