Educational amplifier of low frequency `` Demonstration ''.
Everything else not included in the sectionsNot included in these sectionsThe educational low-frequency amplifier "Demonstration" (code name) has been produced since 1959 by the Leningrad plant "Elektrodelo". The complete amplifier is shown in the first three photos. In the final stage, there could be a 6P3S or 6P6S radio tube. The maximum output power on the 6P6S radio tube reached 3 W and on the 6P3S radio tube - 5 W. The sensitivity of the amplifier was quite sufficient to amplify the signal from a piezoelectric pickup and a dynamic microphone with a transitional transformer. 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.
