Blocking Oscillator - Diving into the Vacuum Tube era

Gregory explains the Blocking Oscillator topology, used in the Vacuum Tube era, as the standard way of creating pulses and periodic signals.

The Blocking Oscillators is a relaxation oscillator, that uses positive-feedback, accomplish by a pulse transformer, to create narrow pulses with very fast rise/fall times.

The pulse repetition rate and pulse width is defined by a complex interaction between the tube grid capacitor, grid resistance, pulse transformer magnetizing inductance and the tube characteristics.

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Reference:
https://worldradiohistory.com/BOOKSHELF-ARH/Technology/Rider-Books/Rider-Blocking-Oscillators-Schure.pdf ... https://www.youtube.com/watch?v=PIJ3I3o4ANI