Broadband amplifier (CB9005E)

For a 75ohm output, this circuit was found in ancient American documentation, using components from the time.

Water alarm with lock (CB6957E)
Published in an old Popular Electronics, this circuit makes use of components that are still...
Timer for enlargers (CB8351E)
Suggested for the control of photographic enlargers, this 1967 General Electric circuit uses still...
Neon oscillator from 1 to 10 Hz (CB8037E)
Found in old documentation, this oscillator operates with high voltage. The diode must be of the...