High tension power supply rvfm 605 007 the edu lab high tension power supply is designed specifically for thermionic experiments such as the teltron double fine beam tube it can also be used for experiments requiring a high tension supply such as ionization current etc it provides two independent outputs of 0 35v and 0 350v 100ma maximum with continuously adjustable voltages two auxiliary cathode heater outputs are also provided rvfm high tension power supply