Historic 150 W Tube Amplifier Telefunken Ela V407 from 1937

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Pictures here: Tubeamplifier operates two triodes RV278 (thoriumoxidecathode), each 50W plate dissipation, 1100Volts. RE604driver and parafeed circuit. Towards the end you heare the inputchoke of the power supply reacting with the variing load, meanwhile the amplifier is connected to a