Analog Devices LT3757 switching regulator.This power supply is a modern take on high voltage converters featuring top of the line components: The former option generally means poorly built products and the later is either inefficient or a fire hazard. As a result many hobby nixie projects tend to use Chinese made boost converters or integrate designs built on very old chips (34063 or even 555s!). Working with high voltage DC/DC switchers can be intimidating.
