Found in a 1947 publication, this circuit uses 4 parallel/push-pull tuber in the output stage. The circuit employs dual power supply with two rectifier tubes.
This 100-second timer was found in a 2000 Poptronics. The magazine no longer exists, but the...
This good amplifier with output in complementary symmetry is from an old publication, and modern...
This 5.1 MHz oscillator was found in a 1980s American documentation. The used operational...