This benchtop equipment was found in Radio Electronics magazine from April 1960. The two double valve circuit is powered from mains power.
The purpose of this circuit found in an old Elektor is to light a lower power lamp when the bigger...
This is the circuit of a small commercial amplifier from the 1970s from Philips Argentina. The...
The components used in this configuration are not common today. The circuit is from the 1982 SGS...