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.

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Short Wave Receiver (CB17638E)
This receiver receives signals in the range of 3.2 to 16 MHz, presenting a good sensitivity thanks...
3 MHz System with AGC (CB6480E)
This circuit makes use of an unusual Analog Devices component today. The circuit is from a 90's...