Wien Bridge Oscillator (CB8093E)

This circuit was found in a Popular Electronics from the 90s. Transistors admit equivalents, as well as the operational.

Crystal Tester (CB13530E)
This circuit was obtained in a 1976 amateur radio manual. The circuit can be made with a 2N2222...
1 MHz FET Oscillator (CB6148E)
This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time...
7W Hybrid Amplifier (CB21794E)
Found in a Mullard Manual from 1960, this circuit contains a transistor push-pull output being...