A floating, high voltage power source useful for supplying charge for quantitative electrostatic experiments, gas discharge tubes needing a filament supply & spectrum tubes. Continuously variable output up to 5kV. Positive or negative terminal may be safely connected to earth and / or one side of the filament. 6V/1A AC or 12V/0.5A AC filament heating supply, insulated for EHT voltages. A rotary control knob provided on the front panel adjusts the EHT output. Non-hazardous maximum load capacity of 3mA (short circuit current). Analogue moving coil meter. All outputs via clearly marked 4mm shielded sockets. Both input and output fuse protected. Two parts metal housing. Indicator type ON/OFF switch supplied complete with detachable mains lead.