With a 475 V supply, this amplifier published in Radio Electronics magazine in January 1958 offered good power. The amplifier used 4 tubes.
This symmetrical power source for currents up to 1 A was found in a 1986 documentation, serving...
The great advantage of the circuit shown in the figure is that its frequency is controlled by a...
This circuit from General Electric was found in a 1967 documentation. The SCR is of the time, as...