This circuit that converts voltages from a battery into high voltages for tube circuits was found in Radio Electronics magazine from February 1960. The transformer is of a special type.
This circuit is from 1989 documentation. It uses the TDA2002 as a modulator and the unusual power...
This configuration is suggested by Mullard (Philips) in an old manual of 555 integrated circuits....
The figure shows how to use a CMOS amplifier as a crystal-controlled oscillator. The circuit is...