This 5-tube hi-fi amplifier was found in an American publication from 1947; The output is in class B and the circuit uses a source with transformer.
We found this configuration of band rejector filter or band rejector with operational 741 in a...
With an 18 V input, this regulator was found in Philips documentation from the 60's. The...
Found in old American documentation, this receiver transmits signals via the power grid. We can...