An article in Radio Electronics magazine from November 1958 showed the construction of this tube audio oscillator. Note the use of lamps as a stabilizer to obtain better sinusoidal signals.
This simple PWM circuit was found in the March 1991 issue of Radio Electronics magazine. The...
This circuit divides the grid 60 Hz frequency to obtain 20 Hz to drive mechanical watches used at...
Originally, this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...