This 100 MHz bridge circuit was found in an American 1970s documentation. The supply voltages are not indicated, nor are the tubes.
This variable power supply circuit was found in a German publication from the 1980s. The circuit is...
This circuit is suggested by Texas Instruments and is based on a relaxation oscillator with...
In the figure we have a typical Wien Bridge oscillator with AGC. The negative waveform is sampled by...