This 100 MHz bridge circuit was found in an American 1970s documentation. The supply voltages are not indicated, nor are the tubes.
Found in a publication from the 60's, this circuit uses the CK722, germanium transistor of the...
This circuit produces the sound of a motorcycle or an outboard motor. The frequency is adjusted in the...
This circuit was found in Popular Electronics from February 1967. Transistors are from the period....