This 50 kHz to 250 W circuit was found in an old RCA documentation. The transformer is a commercial type of the time and the output voltage is 80 to 90 V.
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...