H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
H01J37/02—Details
H01J37/24—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for
H01J37/242—Filament heating power supply or regulation circuits
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N5/00—Details of television systems
H04N5/63—Generation or supply of power specially adapted for television receivers
