This configuration was found in an English magazine from 1965. It is valid for any junction FET. The input impedance is 5.5 M ohm higher than conventional stages.
The author has many books he had written in Eglish (See the Biography) published by famous...
This oscillator can run in frequencies up 10 MHz depending on the Power supply voltage. The 1 µF...
Found in an American paper from the 90's, this circuit can be adjusted to pass frequencies above 30 to 300...