The circuit in the figure shows how we can implement a tube voltage quadrupler using 4 simple diode tubes. The working voltage of the capacitors must be twice the peak voltage of the network, or at least 300 V.

The circuit in the figure shows how we can implement a tube voltage quadrupler using 4 simple diode tubes. The working voltage of the capacitors must be twice the peak voltage of the network, or at least 300 V.