Quick Answer: The EHT Power Supply provides a continuously variable 0 - 5kV dc output, limited to 2mA, plus a 6.3V ac heater output for electrostatics experiments and vacuum tubes such as the deflection e/m tube.
Last updated: October 2026
Key Features
EHT output variable from 0 to 5kV dc by rotary control
Sockets take standard 4mm plugs and shrouded plugs
Technical Specifications
Specification
Value
Output
0 - 5kV dc, fully isolated
Current limit
2mA (second output 50µA)
AC output
6.3V ac, 3A maximum
Display
3 digit backlit LCD showing kV
Fuse
T250mA time delay
Ratings
230V ac 50Hz 72VA
Temperature range
10 - 40°C
Humidity range
10 - 90 %RH
About This Product
This supply is meant for school electrostatics experiments, including ionisation, and for powering simple spectrum tubes and electron tubes that need a low-voltage heater or filament. The EHT and ac outputs can run at the same time. A quiet internal fan keeps the unit cool, and a cable retainer with winding hooks and a clip stores the mains cord neatly.
Frequently Asked Questions
Q1. Can it power any vacuum tube? No. The EHT output is limited to 2mA, so tubes that need more current than that cannot be driven by this supply.
Q2. Can the EHT and heater outputs be used together? Yes. Both outputs may be used simultaneously, as required by the apparatus connected.
