Tube/Valve Power Supply Unit

Description

For experiments with electron tubes (vacuum tubes, thermionic valves), a power supply unit is required that provides at least the anode voltage and the heating voltage as well as a grid bias voltage. In order to avoid interference to a large extent, switching power supplies were dispensed with and the power supply unit was built up with a transformer and linear regulators. In the current version, the power supply provides the following infinitely variable voltages:

Anode voltage: +200V...+330V | 100mA DC
Grid bias voltage: -12V...-100V | 20mA DC
Heating voltage 1: +2.3V...+6.5V | 3.5A DC
Heating voltage 2: 6.3V | 5A AC

The DC heating voltage is slowly increased by a soft start function.

It is planned to measure and display the currents and the voltages in a second expansion step, as well as to carry out the control with a microprocessor.