Complementary symmetry stage (CB22237E)

We found this step in an old documentation. The transistors are of the time and the power supply symmetrical.

20 W per channel NEC amplifier (CB6984E)
Found in an American publication from the 1980s, this circuit can be found in commercial sound...
Asymmetric Astable 4093 (CB16089E)
With the use of an additional diode and a resistor, the configuration of the figure can be...
Sound Level Meter (CB20911E)
This sound meter or sonometer was found in a Popular Electronics from the 80's. The circuit can be...