Relaxation oscillator using a Thyratron (T426E)

This oscillating circuit for a frequency of 588 KHz was found in a book on electronic designs with modern tubes.

TTL Oscillator (CB6150E)
This oscillator can generate 2 to 10 MHz signals and was found in an American 1980s documentation. The...
Testing Diodes with the Oscilloscope (CB1488E )
The figure shows how to use an oscilloscope for diode test. The circuit presents the...
Balanced Modulator (CB4191E)
This circuit is intended for SSB transmission by generating two sideband signals with the carrier...